Insulin allergy: clinical manifestations and management strategies

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Allergy 2008: 63: 148–155                                                               2008 The Authors
                                                                                       Journal compilation  2008 Blackwell Munksgaard
                                                                                       DOI: 10.1111/j.1398-9995.2007.01567.x

Review article

Insulin allergy: clinical manifestations and management strategies

 Insulin allergy in patients with diabetes mellitus on insulin treatment is a rare      L. Heinzerling1,2, K. Raile3,
 condition. It is suspected upon noticing immediate symptoms following insulin          H. Rochlitz4, T. Zuberbier1, M. Worm1
 injections. The immediate vital implications for the patient call for prompt           1
                                                                                         Department of Dermatology and Allergy, Charit
 diagnosis and management of insulin allergy.We review current knowledge and            Universittsmedizin, Berlin, Germany; 2Harvard
 procedures based on four diabetic patients who presented in our clinic. Insulin        School of Public Health, Boston, MA, USA;
 allergy was suspected as they showed immediate symptoms after insulin injection        Departments of 3Pediatric Endocrinology and
                                                                                        Diabetes; 4Endocrinology, Diabetes and Nutrition,
 (urticaria, rash, angioedema, hypotension, dyspnea). A detailed allergologic           Charit Universittsmedizin, Berlin, Germany
 work-up was performed and adequate therapy was initiated. In three of the four
 patients, a specific immunotherapy was started whereas in one patient a switch          Key words: drug reaction; IgE; skin prick test; specific
 to oral antidiabetics was possible and consequently initiated. By standard prick       immunotherapy; tolerance; type 1 allergic reaction.
 testing and measurement of specific IgE antibodies, a type 1 IgE-mediated
 allergy was confirmed. After initiation of insulin immunotherapy, the symptoms          Lucie Heinzerling
 completely resolved in two out three of patients and significantly improved in the      Harvard School of Public Health
 third patient. The fourth patient was successfully switched to oral antidiabet-        677 Huntington Avenue
                                                                                        Boston
 ics.Insulin allergy is a rare but severe condition that calls for immediate aller-     MA 02115
 gological work-up. It can be managed well in close cooperation between the             USA
 diabetologist and the allergologist. Specific immunotherapy is efficient and
 should be considered.                                                                  Accepted for publication 19 September 2007

Adverse reactions to insulin have significantly decreased       at hand. Rarely, insulin allergy can be fatal despite
since the introduction of human insulin preparations (1).      appropriate interventions (8).
However, cases with insulin allergy continue to present in        In this review, the diagnostic procedures and manage-
the clinic. Symptoms range from local injection site           ment options for insulin allergy are reviewed in the light
reactions to severe generalized anaphylactic reactions (2).    of four severe cases of IgE-mediated allergic reaction to
Allergic reactions to insulin include immediate type           insulin and/or insulin components. We suggest a detailed
IgE-mediated reactions, type 3 immune complex type             allergological work-up and discuss a management proto-
(Arthus reaction-localized or serum sickness-generalized)      col.
or delayed type hypersensitivity reactions. Furthermore,
reactions with a delayed onset, i.e. 6 h after injection of
insulin may develop (3). These delayed reactions include
                                                               Clinical presentation
induration at the injection site with histological signs of
leukocytoclastic vasculitis (4). Finally, some reactions are   The clinical presentation of insulin allergy can range
even more delayed with onset after 8–24 h and may be on        from minor local symptoms to a severe generalized
account of delayed hypersensitivity. This has been             allergic reaction. IgE-mediated symptoms occur imme-
reported most frequently for insulin preparations con-         diately after insulin injection. Skin reactions vary from
taining zinc (5) or protamine (6). It is important to          local erythema and swelling at the injection site to
distinguish insulin allergy that manifests with allergic       generalized reactions like urticaria and angioedema
symptoms from immune-complex mediated insulin resis-           (9, 10). Interestingly, flare reactions can also be elicited
tance due to IgG antibodies that bind to insulin to            at the former injection sites upon insulin injection (11).
produce a nonfunctional complex (7).                           Furthermore, pruritus of soles and palms, generalized
   This review focuses on the type 1 allergy with an           flushing, and itching can occur (12). In rare severe cases,
immediate reaction to insulin preparations. As insulin is a    anaphylaxis with dyspnea and hypotension has been
vital drug for the insulin-dependent patients, a quick         observed (2, 13). In one case, a diabetic patient
diagnostic work-up and adequate management is critical         developed a severe anaphylactic reaction in which
for diabetic patients presenting with symptoms suspected       symptoms could not be managed, despite attempts to
to be of allergic origin. Upon diagnosis, most patients can    desensitize and the patient succumbed upon reintroduc-
be satisfactorily managed with various treatment options       tion of insulin (8).

148
Insulin allergy

                                                                                                                                                                         hypoglycemia with human
  The four patients presented in this review were between

                                                                                                                                                                        Improvement of symptoms,
                                                                                                                                                                         but worse perception of
12 and 87 years of age with different types of diabetes

                                                                                                                                                                                                                                          Cessation of symptoms
                                                                                                                                                                                                           Cessation of symptoms

                                                                                                                                                                                                                                                                         Cessation of symptoms
                                                                                                                                                                         insulin preparation
mellitus and varying local and systemic symptoms
(Table 1).

                                                                                                                                          Outcome
Diagnostic work-up
The presence of an insulin sensitization can be proven by

                                                                                                                                                                         human insulin (Insuman Rapid)

                                                                                                                                                                                                                                                                          insulin analogue (Novo-Rapid)
skin prick test and determination of specific IgE (14). A

                                                                                                                                                                        Specific immunotherapy with

                                                                                                                                                                                                           Specific immunotherapy with

                                                                                                                                                                                                                                                                         Specific immunotherapy with
                                                                                                                                                                                                           Change to oral antidiabetics
                                                                                                                                                                                                            human insulin (Huminsulin
diagnostic algorithm in suspected insulin allergy has been
suggested by Jaeger et al. (15) including intradermal skin
testing, quantification of insulin-specific IgG and IgE in
the serum, and analysis of the time-dependent binding/

                                                                                                                                          Management
dissociation curves of the insulin-neutralizing antibodies

                                                                                                                                                                                                            normal)
in an ex vivo/in vitro assay.
   Diagnostic work-up for the four patients included skin
prick testing, assessment of specific IgE and IgG4, and

                                                                                                                                                                        Immediate monitoring in hospital
diagnostic tests to exclude other causes of the allergic

                                                                                                                                                                         Infusat/Actrapid), NPH-insulin

                                                                                                                                                                                                                                                                         Change of insulin preparation,
                                                                                                                                                                        Change of insulin preparation

                                                                                                                                                                         (Protaphane), insulin aspart,

                                                                                                                                                                         pump, symptomatic therapy
                                                                                                                                                                         glargine), change to insulin
symptoms. Skin prick testing included the insulin prep-

                                                                                                                                                                                                                                                                          symptomatic therapy with
                                                                                                                                                                         insulin lispro, and insulin

                                                                                                                                                                                                                                          Symptomatic therapy with
                                                                                                                                                                         (regular insulin (Insuman

                                                                                                                                                                         with antihistamines and
arations used, alternative insulin preparations, additives
and the components of the skin test kits provided by the
pharmaceutical companies (Sanofi aventis, Bad Soden am

                                                                                                                                                                         corticosteroids

                                                                                                                                                                                                                                           antihistamines

                                                                                                                                                                                                                                                                          antihistamines
Taunus, Germany; Novo Nordisc, Bagsvaerd, Denmark).                                                                                       Trial attempts
Positivity was defined as wheal diameter of more than
3 mm after 15 min. Histamine (10 mg/ml) and diluent
(0.9% NaCl) served as positive and negative control.
Insulin-specific IgG antibodies were assessed with the

                                                                                                                                                                                                                                                                          mite, grass, birch), food allergy
                                                                                                                                                                                                            and continuous treatment with

                                                                                                                                                                                                                                                                         Allergic rhinitis (cat, house dust
                                                                                                                                                                                                           Sickle cell anemia (splenectomy
CentAK anti-IA (Medipan, Selchow, Germany) which

                                                                                                                                                                                                                                                                          (hazelnut, oat flour), allergic
                                                                                                                                                                                                           Hypertension, coronary artery
                                                                                                                                                                        Allergic rhinitis (cat, grass),

determines specific antibodies against human insulin. The

                                                                                                                                                                                                                                                                          drug reaction to penicillin
                                                                                                                                                                                                            disease, apoplexapoplexy
                                                                                                                                          Other (allergic) conditions

                                                                                                                                                                         allergic drug reaction to

estimate for normal values determined by Jaeger et al.

                                                                                                                                                                                                            low dose penicillin)
(15) was around 0.038 mU/ml (95% CI 0.025–0.052 mU/
ml). Additionally, specific IgE against latex, protamine
and penicilloyl G and V were assessed (CAP system;
                                                                                                                                                                         penicillin

Pharmacia, Uppsala, Sweden).

                                                                                                                                                                                                                                           injection site, diplopic images,
                                                                                                                                                                        Urticaria, pruritus, angioedema,

                                                                                                                                                                                                            angioedema, dyspneadyspnoe
                                                                                                                                                                         confusion, paresthesia (hands

Management
                                                                                                                                                                         macular exanthema, insulin

                                                                                                                                                                                                                                          Urticaria, pruritus, erythema,
                                                              Table 1. Patient characteristics, symptoms, management, and outcome

                                                                                                                                                                                                                                          Urticaria, pruritus, erythema
                                                                                                                                                                                                                                           induration and swelling at
                                                                                                                                                                                                           Urticaria, nausea, paleness,
                                                                                                                                                                         malaise with palpitations,

                                                                                                                                                                         and mouth), induration at
                                                                                                                                                                         diplopic images, general

First line management of insulin allergy besides symp-
                                                                                                                                                                         injection site, maculous

tomatic therapy with antihistamines calls for a switch to a
                                                                                                                                          Symptoms

                                                                                                                                                                                                                                           insulin resistance

different insulin preparation. Especially in patients that
show allergic reactions to components of the preparation
                                                                                                                                                                         resistance

a switch to a preparation which does not contain the
specific agent can lead to a cessation of symptoms (16).
To offer alternatives to the patient allergic to insulin
analogues, lispro, aspart and glargine with the exchange
                                                                                                                                    Diabetes
                                                                                                                                    mellitus

of two (B28-proline and B29-lysine), one (B28-aspartate)
                                                                                                                                                                                                                                          Type II

                                                                                                                                                                                                                                                                         Type II
                                                                                                                                                                        Type I

                                                                                                                                                                                                           Type I

or the exchange of one (A21-glycine) and addition of two
amino acids (B31-arginine and B32-arginine), respec-
tively, have been used (17–20). Although these represent
                                                                                                                                    gender (M/F)

options for patients with allergy to insulin (21) they have
                                                                                                                                                                                                                                                                         60, M
                                                                                                                                                                        36, F

                                                                                                                                                                                                           13, F

                                                                                                                                                                                                                                          83, F
                                                                                                                                       Age,

also been known to provoke hypersensitivity reactions
including type 1 allergies in clinical practice (22–25).
Detemir, a long-acting insulin analogue, differs from
                                                                                                                                    Patient

native insulin by the deletion of amino acid B30 and
                                                                                                                                    Nr.

addition of a myristic acid residue at B29 and has also
                                                                                                                                                                        1

                                                                                                                                                                                                           2

                                                                                                                                                                                                                                          3

                                                                                                                                                                                                                                                                         4

                                                                                                                                                                                                                                                                                                          149
Heinzerling et al.

been reported to elicit allergic reactions (26, 27). One       insulin injections. Additionally, the local injection site
report even implied the potential of insulin analogues to      showed an induration upon physical examination. Fur-
be more allergenic than insulin (28), which led to a debate    thermore, intermittent diplopia without periorbital edema
on this preposition (29).                                      was present. Insulin therapy with human insulin was
   One method to induce tolerance is the application of        increasingly less effective in controlling the glucose level
insulin as continuous subcutaneous insulin infusion            and showed progressively more intense side effects. The
(CSII). Several case reports describe the beneficial effect      following insulin preparations had been used: regular
of this form of application in allergic diabetic patients      insulin (Insuman Infusat or Actrapid), NPH-insulin
(30–34). Furthermore, the use of specific immunotherapy         (Protaphane), insulin aspart, insulin lispro, and insulin
for the treatment of insulin allergy has been reported         glargine. At the time of admission to our unit, the patient
previously and was successful in many cases (35). In our       was treated with porcine regular insulin (Actrapid suis
patients, prior to the specific immunotherapy, various          MC) in an infusion pump. Besides the acute symptoms,
treatment options including change of insulin, change of       the patient had a seasonal allergic rhinoconjunctivitis
insulin application and symptomatic therapy with anti-         with sensitization to grass pollen and a history of allergic
histamines had been attempted (Table 1). Specific immu-         reaction to penicillin. The immunological evaluation
notherapy consists of successive subcutaneous injections       revealed: (1) positive skin testing for the additives zinc
of insulin under close monitoring with preparation for         and protamine, and insulin preparations Insulin novo
emergency intervention in an in-patient setting. The           semilente, Insuman rapid, and insulin glargine in intra-
initial dose for the specific immunotherapy depends on          cutaneous testing. The porcine insulin Actrapid suis MC
the grade of sensitization and the duration is usually up to   showed a reaction, though of insufficient magnitude to be
2 days. In our patients who presented with severe              classified as positive. (2) High titers of insulin-specific IgE
symptoms, the initial dose was 0.00001 units, with             with CAP class 4 (30.6 kU/l) but no protamine-specific
subsequent doses progressively increasing 10-fold up to        IgE (
Insulin allergy

allergy. Currently, insulin pump treatment with insulin         insulin that provoked symptoms despite intensive anti-
aspart continues and metabolic control is good.                 histamine therapy, a specific immunotherapy with regular
                                                                insulin (Insuman Rapid) was performed. After the 2-day
                                                                course the symptoms did not recur.
Patient #3
An 83-year-old female patient with type 2 diabetes [body
mass index (BMI), 25] received insulin treatment for
                                                                Results
10 months with regular and NPH-insulin (Actrapid and
Protaphane). She had hypertension, coronary artery dis-         At our department, we diagnosed four patients with a
ease, and had previously suffered from an apoplexy. The          type 1 sensitization towards insulin (Table 2) and allergic
leading allergic symptoms were erythematous reactions,          symptoms in clinical use of insulin. Respective insulin IgE
urticaria, and pruritus immediately after injection. Addi-      antibodies were present in these four patients (Table 2).
tionally, her glucose levels were increasingly hard to          Furthermore, all patients showed a positive skin prick test
control. Furthermore, the injection site showed induration.     or intracutaneous test to insulin preparations and/or
Oral antihistamine treatment improved the condition but         insulin analogues. Two patients presented with a sensi-
did not completely resolve it. Immunological evaluations        tization to additives in the insulin preparations (one to
revealed: (1) positive skin prick testing for regular insulin   protamine and zinc, and one to cresol). Three out of three
(Actrapid), mix insulin (Berlinsulin H 30/70, Huminsu-          patients tested had IgE against penicillin and two patients
lin Profil 30/70), NPH-insulin (Basal Hoechst, Huminsulin        had a history of allergic reactions to penicillin.
Basal, Berlinsulin Basal), zinc insulin (Novo Ultratard),          During the specific immunotherapy regimen that each
insulin aspart and insulin lispro. Skin prick testing for the   of the three patients underwent, no complications
compounds with the Novo Nordisc insulin allergy kit was         occurred and symptoms improved in one patient and
negative. Intracutaneous testing was positive for porcine,      completely disappeared in the other two patients. In the
bovine and more positive for human insulin. (2) Insulin-        fourth patient, a change to oral antidiabetics was suffi-
specific IgE against human CAP class 2 (2.39 kU/l), bovine       cient to control blood glucose and insulin treatment could
CAP class 2 (2.06 kU/l) and porcine CAP class 1 (2.61           be stopped with no further allergic symptoms.
kU/l) insulin were present. Insulin-specific IgG were
normal. The patient was successfully transferred from
insulin to oral antidiabetics (metformin and repaglinide)
                                                                Immunologic mechanisms
and allergic symptoms resolved completely.
                                                                Type 1 allergic reactions are mediated by IgE against
                                                                insulin or components of the insulin preparations. These
Patient #4
                                                                immunologic reactions can be elicited by different anti-
A 60-year-old male patient with type 2 diabetes was treated     genic determinants in the recombinant proteins, which
with insulin for 5 months and presented to our outpatient       are not present in the endogenous human insulin (37) or
department because of the onset of urticaria, erythema,         they may also be on account of the immunogenicity of
flush, and pruritus. He had been treated with insulin            one of the nonprotein components (38). It has also been
glulisine. After the symptoms started he was switched to        assumed that some modification of insulin, such as
insulin aspart. However, the allergic symptoms did not          aggregation, may lead to the immunologic reactions (39,
improve. Since 1 month he received NPH-insulin (Prota-          40). In rare cases, the IgE is directed to the endogenous
phane) in addition. Oral antihistamines had improved the        insulin of the patient (41, 42). The following additives in
symptoms but not resolved them. Additionally, he suffered        insulin preparations have been observed to induce allergic
from allergic rhinitis and asthma and reported a drug           reactions or sensitizations: zinc, protamine (42, 43), and
reaction to penicillin. The immunological evaluations           cresol (44). Protamine can act as adjuvant (45), and the
revealed the following: (1) positive skin testing showed an     crystalline zinc solutions can alter immunogenicity by
urticaria factitia with equally positive reactions for NaCl,    changing the structure of the B-chain (46, 47). Interest-
human insulin, and cresol. (2) Quantification of insulin-        ingly, Madero et al. report a case of a diabetic patient
specific antibodies showed insulin-specific IgE CAP class 1       with IgE-mediated allergic reactions to recombinant
(0.43 kU/l) while insulin-specific IgG was normal. Inter-        human insulin and a positive skin test for glargine
estingly, the patient showed penicillin-specific antibodies:     possibly mediated by specific IgG4 (48).
penicilloyl V CAP class 1 (0.56 kU/l), ampicilloyl CAP             The route of administration also determines whether
class 1 (0.47 kU/l) as well as latex-specific antibodies         allergic symptoms occur as described in a patient by
CAP class 2 (2.24 kU/l) with a total IgE of 210 kU/l.           Asai et al. who showed no symptoms upon intravenous
Other triggers for the urticaria, e. g. Helicobacter pylori     injection of insulin, whereas symptoms on subcutaneous
infection were excluded. Furthermore, the patient had           injection persisted (36).
sensitizations to house dust mite, grass pollen, cat and           Specific immunotherapy induces tolerance in many
birch. Because of a suspected IgE-mediated allergy to           patients with IgE-mediated immediate allergic reactions.

                                                                                                                       151
Heinzerling et al.

                                                                                                                                                                                                                                                                           Even though the mechanism of specific immunotherapy

                                                                                                                                                                                                                                negative; helicobacter pylori: negative;
                                                                                         IgG insulin antibodies: positive; tyrosin
Insulin allergy

                                       Immediate symptoms after
                                       insulin injection:                                                   Delayed/prolonged symptoms
                                       • Urticaria                                                          after insulin injection:
                                       • Angioedema                                                         • Induration at injection site
                                       • Rash                                                               • Erythematous burning lesions
                                       • Nausea/diarrhea                                                      at injection site
                                       • Cardiovascular symptoms                                            • Nausea/diarrhea
                                       • Dyspnea

                                             Skin prick test/              Assessment of               Assessment of          Epicutaneous skin
                       Exclude other
                                             intracutaneous test:          specific IgE:               specific IgG:          test:
                       reasons for
                                             • Insulin preparations        • Insulin                   • Insulin              • Additives
                       symptoms
                                             • Insulin additives           • Protamine

                           Negative                       Positive                          Positive       Positive                    Positive

                                                                                                          Immune-
                                                    IgE-mediated                                                                   Delayed
                                                                                                       complex mediated
                                                   insulin allergy                                                              hypersensitivity
                                                                                                           reaction

                                                                        Possibly associated with
                                                                           insulin resistance

Figure 1. Diagnostic approach in suspected insulin allergy.

Table 3. Insulin preparations with respective additives

                                                                                                          Additives
                                                                                                                                                         Duration of
Name of insulin                           Type of insulin             Zinc      Protamine        Cresol                      Other                       action

Actrapid                          Human                                ·                           ·         Glycerol                                    2–8   h
Berlinsulin H Normal              Human                                                            ·         Glycerol                                    2–8   h
Huminsulin Normal                 Human                                                            ·         Glycerol                                    2–8   h
Insuman Rapid                     Human                                                            ·         Glycerol                                    2–8   h
Insulin B Braun                   Human (enzymatically produced                                    ·         Glycerol                                    2–8   h
                                    from porcine insulin)
Velosulin                         Human                                ·                           ·         Glycerol                                    2–8 h
Insulin S Berlin-Chemie           Porcine                                                                    Methyl-4-hydroxybenzoat                     2–8 h
Insulin S.N.C. Berlin-Chemie      Porcine                                                          ·         Glycerol                                    2–8 h
Novorapid                         r-DNA insulin aspart                 ·                           ·         Phenol, glycerol                            2–5 h
Apidra optiset                    Analogum (glulisin)                                              ·         Trometamol                                  2–5 h
Humalog                           Analogum (lispro)                    ·                           ·         Glycerol                                    2–5 h
Actraphane                        Human                                ·            ·              ·         Phenol, glycerol                            Up to 24   h
Berlinsulin H                     Human                                ·            ·              ·         Phenol, glycerol                            Up to 24   h
Huminsulin Basal for pen          Human                                             ·              ·         Phenol, glycerol                            Up to 24   h
Huminsulin Basal                  Human                                ·            ·              ·         Phenol, glycerol                            Up to 24   h
Huminsulin Profil                 Human                                             ·              ·         Phenol, glycerol                            Up to 24   h
Insulin B Braun Basal             Human (enzymatically produced        ·            ·              ·         Phenol, glycerol                            Up to 24   h
                                    from porcine insulin)
Protaphane                        Human                                ·            ·              ·         Phenol                                      Up to 24 h
Insuman Basal                     Human                                ·            ·              ·         Phenol, glycerol                            Up to 24 h
Monotard                          Human                                ·                                     Methyl-4-hydroxybenzoat                     Up to 24 h
B Insulin S                       Porcine                                                                    Methyl-4-hydroxybenzoat, Aminoquinurid      Up to 24 h
Insulin Novo Semilente MC         Porcine                              ·                                     Methyl-4-hydroxybenzoat                     Up to 24 h
Humalog Mix                       Analogum (lispro)                    ·            ·              ·         Phenol, glycerol                            Up to 24 h
NovoMix 30                        Insulin aspart-protamin cristals     ·            ·              ·         Phenol                                      Up to 24 h
Levemir                           Insulindetemir                       ·                           ·         Phenol                                      Up to 24 h
Ultratard                         Human                                ·                                     Methyl-4-hydroxybenzoat                     More than 24 h
Lantus                            Analogum (glargin)                   ·                           ·         Glycerol                                    More than 24 h

                                                                                                                                                                        153
Heinzerling et al.

been associated with anaphylaxis during reversal of                      (32, 33, 60) and surprisingly one case of intravenous
intraoperative heparin anticoagulation by protamine in                   therapy (36). The specific immunotherapy regimen was
cardiac catheterization (42, 56, 57). Treatment options                  effective and well tolerated. However, a few cases of
for insulin allergy include the symptomatic therapy with                 ineffective specific immunotherapy (61) and short dura-
antihistamines. However; sensitization may be accentu-                   tion of effect have also been reported (9). A rare
ated over time. Especially when local symptoms are                       complication has been described in the induction of
increasing in intensity they may precede systemic reac-                  insulin IgG antibodies leading to insulin resistance (62).
tions. When symptomatic therapy is not sufficient, and                        In conclusion, insulin allergy is a rare condition that
change of insulin preparation not feasible due to                        calls for a quick allergological work-up. It can be
multiple sensitizations or difficulties in stabilizing the                 managed well in close cooperation between the diabetol-
blood sugar with a certain insulin preparation, specific                  ogist and the allergologist. Specific immunotherapy
immunotherapy is a good option for the patient. In                       should be considered if a type 1 allergy to insulin is
severe cases it has previously been combined with                        diagnosed and may lead to a complete resolution of
prednisolone (35, 58).                                                   symptoms.
   In accordance with results from other groups (31, 35),
specific immunotherapy was effective in reducing symp-
toms of type 1 allergy to insulin or insulin components in
                                                                         Acknowledgements
all three patients described here. It was also associated
with a decrease in IgE titers as has been described before               We thank Dr Elsbeth Oestmann and Dr Christian Hessel from the
(59). Our regimen used several ascending single doses,                   Charité University Hospital, Department of Dermatology and
whereas there are also reports of successful specific                     Allergy, for patient care. We also thank Jeff Berens for language
                                                                         editing of the manuscript.
immunotherapy with continuous subcutaneous infusion

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