Jeffrey G. Demain

The natural history of exposure to the imported fire ant (Solenopsis invicta).

BACKGROUND Imported fire ants (IFA) are a common cause of insect venom hypersensitivity in the southeastern United States. The purpose of this study was to determine the sting attack rate and development of specific IgE in an unsensitized population. METHODS Study participants consisted of 137 medical students with limited exposure to IFA-endemic areas who were temporarily training in San Antonio, Tex. Subjects were surveyed for prior IFA exposure with a questionnaire, and IFA-specific IgE was evaluated with RAST and intradermal skin testing. Evaluations were performed on arrival and reported at departure from the endemic area 3 weeks later. RESULTS One hundred seven subjects completed the study. Field stings were reported in 55 subjects, resulting in a sting attack rate of 51%. In these 55 subjects 53 (96%) reported a pustule or a small local reaction at the sting site, one (2%) reported an isolated large local reaction, and none reported a systemic reaction. At the 3-week follow-up skin test and RAST conversions occurred in seven subjects (13%) and in one subject (1.8%), respectively. CONCLUSIONS Even brief exposures to IFA-endemic areas result in significant sting rates and concurrent rapid development of IFA-specific IgE in 16% of stung subjects.

Stinging insect hypersensitivity: A practice parameter update 2016

Reprints: David B. K. Golden, MD, Department o dbkgolden@gmail.com. Disclaimer: The American Academy of Allergy, A accepted responsibility for establishing “Stinging I time. The medical environment is a changing envi of many participants, no single individual, includ practice parameters. Any request for information a the AAAAI or the ACAAI. These parameters are no Disclosures: The following is a summary of inter family member interests). Completed Conflict of In its website. Dr Golden has served on the speaker’s witness for & Trifrolis, PC, and is a section editor UptoDate. The other Work Group members have n conflict with development of a completely unbiase conflicts from influencing the final document in discussions concerning topics related to the poten remove potential bias. In addition, the entire docu sent for review both by invited reviewers and by Chief Editor: David B. K. Golden, MD Practice Parameter Work Group: David B.K. Gold Allergy, Asthma & Immunology Center of Alaska, Allergy Clinic, San Antonio, Texas; David Graft, MD Minneapolis, Minnesota; Michael Tankersley, MD, of Nebraska College of Medicine, and Allergy, Asth University Medical Center, Palo Alto, California. Membersof theJointTaskForceonPracticeParame of Cincinnati CollegeofMedicine,Cincinnati, Ohio; Joa Department of Pediatrics, University ofMissouri-Kan City,Missouri;MatthewGreenhawt,MD,AllergySect of InternalMedicine, University of Texas Southweste Institute, ClevelandClinic, Cleveland,Ohio; RichardN Internal Medicine, New JerseyMedical School, Pulmo Mercy Hospital, and Department of Pediatrics, Unive AffiliatedHospitals, Center for Allergy, Asthma, & Imm Medical College, Hershey, Pennsylvania; and DanaW InvitedReviews(inalphabeticalorder):WesleyBurk Columbia, Maryland; AndrewMurphy, MD, Downin All published practice parameters are available at htt The Joint Task Force hasmade a concerted effort to ac appropriate recognition of such contributions is mad

Practice ParameterStinging insect hypersensitivity: A practice parameter update 2016

Reprints: David B. K. Golden, MD, Department o dbkgolden@gmail.com. Disclaimer: The American Academy of Allergy, A accepted responsibility for establishing “Stinging I time. The medical environment is a changing envi of many participants, no single individual, includ practice parameters. Any request for information a the AAAAI or the ACAAI. These parameters are no Disclosures: The following is a summary of inter family member interests). Completed Conflict of In its website. Dr Golden has served on the speaker’s witness for & Trifrolis, PC, and is a section editor UptoDate. The other Work Group members have n conflict with development of a completely unbiase conflicts from influencing the final document in discussions concerning topics related to the poten remove potential bias. In addition, the entire docu sent for review both by invited reviewers and by Chief Editor: David B. K. Golden, MD Practice Parameter Work Group: David B.K. Gold Allergy, Asthma & Immunology Center of Alaska, Allergy Clinic, San Antonio, Texas; David Graft, MD Minneapolis, Minnesota; Michael Tankersley, MD, of Nebraska College of Medicine, and Allergy, Asth University Medical Center, Palo Alto, California. Membersof theJointTaskForceonPracticeParame of Cincinnati CollegeofMedicine,Cincinnati, Ohio; Joa Department of Pediatrics, University ofMissouri-Kan City,Missouri;MatthewGreenhawt,MD,AllergySect of InternalMedicine, University of Texas Southweste Institute, ClevelandClinic, Cleveland,Ohio; RichardN Internal Medicine, New JerseyMedical School, Pulmo Mercy Hospital, and Department of Pediatrics, Unive AffiliatedHospitals, Center for Allergy, Asthma, & Imm Medical College, Hershey, Pennsylvania; and DanaW InvitedReviews(inalphabeticalorder):WesleyBurk Columbia, Maryland; AndrewMurphy, MD, Downin All published practice parameters are available at htt The Joint Task Force hasmade a concerted effort to ac appropriate recognition of such contributions is mad

Food Allergy and Eosinophilic Gastrointestinal Disorders: Guiding Our Diagnosis and Treatment

Eosinophilic gastrointestinal disorders are a new spectrum of diseases with an old history. Many causes of eosinophilic infiltration of the gut have long been recognized (Table 1). Most of these conditions are autoimmune or primary eosinophilic disorders. The focus of this review is the role of food allergy in the pathophysiology of eosinophilic gastrointestinal disorders. The incidence of atopy, including food allergy, has been on the rise over the past three decades and the association between food allergy and eosinophilic gastrointestinal disorders is becoming better recognized. 1-5 It is now accepted that allergic diseases have reached near epidemic proportions, inflicting nearly 30% of the population. 6 Asthma has risen 160%; atopic dermatitis has risen threefold, and food allergy has more than doubled since accurate records of these conditions have been kept. 7

Anaphylaxis and insect allergy.

Purpose of reviewAnaphylaxis is an acute-onset and potentially life-threatening allergic reaction that can be caused by numerous allergic triggers including stinging insects. This review focuses on recent advances, natural history, risk factors and therapeutic considerations. Recent findingsRecent work suggests that concerns over insect allergy diagnosis continue to exist. This is especially true with individuals who have a convincing history of a serious life-threatening anaphylactic event, but lack the necessary diagnostic criteria of venom-specific IgE by skin test or in-vitro diagnostic methods to confirm the diagnosis. The role of occult mastocytosis or increased basophile reactivity may play a role in this subset population. Additionally, epinephrine continues to be underutilized as the primary acute intervention for an anaphylactic reaction in the emergent setting. SummaryThe incidence of anaphylaxis continues to rise across all demographic groups, especially those less than 20 years of age. Fortunately, the fatalities related to anaphylaxis appear to have decreased over the past decades. Our understanding of various triggers, associated risk factors, as well as an improved understanding and utilization of biological markers such as serum tryptase have improved. Our ability to treat insect anaphylaxis by venom immunotherapy is highly effective. Unfortunately, anaphylaxis continues to be underappreciated and undertreated especially in regard to insect sting anaphylaxis. This includes the appropriate use of injectable epinephrine as the primary acute management tool. These findings suggest that continued education of the general population, primary care healthcare providers and emergency departments is required.

Identification of allergens in the venom of the common striped scorpion

BACKGROUND The common striped scorpion, Centruroides vittatus, is endemic to the southwestern United States and causes thousands of human stings annually. Immediate hypersensitivity reactions to C. vittatus venom have been reported. OBJECTIVES To identify specific IgE in 11 patients with immediate hypersensitivity to C. vittatus and to characterize the allergens present in the venom. METHODS Skin testing to dialyzed, filtered venom was performed in 5 patients. Immunoglobulin E immunoblots to whole milked venom was accomplished with serum samples from 8 patients. Enzymatic properties of whole venom were also determined. RESULTS C. vittatus venom was found to contain 150 microg/microL of protein. Four of 5 patients tested had positive skin test reactions to the purified venom extract, with no late reactions. In all 8 patients, sodium dodecyl sulfate-polyacrylamide gel electrophoresis demonstrated multiple proteins, 9 of which were identified as allergens on IgE immunoblots, ranging in size from 30 to 170 kD. Enzymatic activity was found to include phospholipase A, alkaline phosphatase, esterase, esterase lipase, and acid phosphatase. CONCLUSIONS C. vittatus envenomation may result in immediate hypersensitivity reactions in susceptible individuals. Venom specific IgE can be identified by using skin tests and IgE immunoblots. The allergens identified in these patients had molecular weights distinct from those of known scorpion neurotoxins. A safe and effective skin testing extract can be prepared from dialyzed pure venom and may lead to the widespread ability to diagnose C. vittatus venom allergy.

Insect anaphylaxis: where are we? The stinging facts 2012

Purpose of reviewInsect allergy remains an important cause of morbidity and mortality in the United States. In 2011, the third iteration of the stinging insect hypersensitivity practice parameter was published, the first being published in 1999 and the second in 2004. Since the 2004 edition, our understanding of insect hypersensitivity has continued to expand and has been incorporated into the 2011 edition. This work will review the relevant changes in the management of insect hypersensitivity occurring since 2004 and present our current understanding of the insect hypersensitivity diagnosis and management. Recent findingsSince the 2004 commissioning by the Joint Task Force (JTF) on Practice Parameters of ‘Stinging insect hypersensitivity: a practice parameter update’, there have been important contributions to our understanding of insect allergy. These contributions were incorporated into the 2011 iteration. Similar efforts were made by the European Allergy Asthma and Clinical Immunology Interest Group in 2005 and most recently in 2011 by the British Society of Allergy and Clinical Immunology. SummaryOur understanding of insect allergy, including the natural history, epidemiology, diagnostic testing, and risk factors, has greatly expanded. This evolution of knowledge should provide improved long-term management of stinging insect hypersensitivity. This review will focus primarily on the changes between the 2004 and 2011 stinging insect practice parameter commissioned by the JTF on Practice Parameters, but will, where appropriate, highlight the differences between working groups.

Seal and whale meat: two newly recognized food allergies

BACKGROUND Alaskas marine mammals compose a large portion of the diet of indigenous coastal Alaskan people. Bowhead whales (Balaena mysticetus) and bearded seals (Erignathus barbatus), inhabitants of the Bering and Beaufort seas along Alaskas western and northern coasts, are 2 of the most important subsistence species, serving as major food sources to the native population. OBJECTIVE To describe an Inupiaq boy with symptoms consistent with an IgE-mediated food allergy after ingestion of bowhead whale and bearded seal meat. METHODS Extracts of cooked bowhead whale and bearded seal were prepared, lyophilized, and evaluated for protein content. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis was performed for each extract, followed by transfer to nitrocellulose and IgE immunoblots. Skin prick testing was conducted using reconstituted extracts of 1:10 wt/vol dilution. RESULTS Immunoblots revealed serum specific IgE binding with the extracts of bowhead whale and bearded seal meat. Protein bands of approximately 25, 40, 50, and 90 kDa were found in the seal meat. Protein bands of 55 and 90 kDa were found in the whale meat. Skin prick test results were positive to whale and seal extracts with appropriate positive and negative controls. Ten control subjects had negative reactions to both extracts. CONCLUSION A patient with moderate anaphylaxis to bowhead whale and bearded seal meat demonstrated serum specific IgE by means of immunoblot and positive skin prick test results. This is the first known reported case of specific IgE to these species.

Insect anaphylaxis: addressing clinical challenges

Purpose of review Few allergic reactions are as potentially life-threatening, or frightening to the patient, as anaphylaxis. Food, medications, and insect stings are the three most common triggers of anaphylaxis, but insect allergy provides the best opportunity to understand the biology of anaphylaxis. If the physician can establish a diagnosis of insect allergy, treatment with nearly 98% effectiveness can be initiated. However, sometimes patients have a compelling history of insect sting anaphylaxis, but negative skin and blood tests. This situation presents us with a fascinating opportunity to understand the biology of insect anaphylaxis. Recent findings Recent and ongoing work shows that occult mast cell disease may be critical in insect anaphylaxis. Mastocytosis, serum tryptase and basophil biology are key elements; genetic markers may potentially help us diagnose at-risk individuals and determine proper treatment. Understanding basophil activation may play an additional role both in diagnosis and knowing when therapy might be terminated. Summary Mast cell disease, serum tryptase and basophil biology are providing an opportunity to better understand and manage insect allergy. This evolving understanding should improve long-term management of insect anaphylaxis and help us to better understand the clinical dilemma of appropriate management of the history-positive patient in which testing is unable to detect venom-specific IgE. Furthermore, omalizumabs immunomodulatory effects may play a role in difficult-to-treat insect allergy and mastocytosis. Finally, unrelated to these, but still important as an ongoing risk factor, is the continued underutilization of epinephrine for both acute and long-term management of insect anaphylaxis.

Relationship between IgE and specific aeroallergen sensitivity in Alaskan native children

BACKGROUND The relationship between atopic disease and serum IgE levels varies among populations and geographic regions. The close association of atopy with IgE may not occur in subarctic populations as it does in developed countries in temperate climates. OBJECTIVE To evaluate the relationship between total and specific IgE concentrations and clinical atopy in 5- to 8-year-old Alaskan native children. METHODS Medical record reviews, interviews, physical examinations, serum IgE measurements, and radioallergosorbent testing (RAST) were performed. RESULTS The IgE geometric mean was 122.1 IU/mL. Fifty-eight percent of patients had IgE levels greater than 70 IU/mL, and 17% had levels greater than 1,000 IU/mL; 14% had RAST values greater than 0.35 kU/L. Both IgE levels greater than 70 IU/mL and greater than 1,000 IU/mL were associated with RAST values greater than 0.35 IU/L (P = .004) and early wheezing (P = .005) but not with current wheezing, asthma, eczema, or a history of allergies. A RAST value greater than 3.51 kU/L was associated with eczema (P = .04) but not with allergies or wheezing. Children with current wheezing were more likely to have allergies (P = .03) but not eczema, an IgE level greater than 70 IU/mL, or a positive RAST value. Children hospitalized with respiratory syncytial virus (RSV) were not more likely than controls to have current wheezing. CONCLUSIONS Elevated serum IgE concentrations, including levels greater than 1,000 IU/mL, are common among Alaskan native children; positive RAST reactions to aeroallergens are not. The IgE levels do not relate to wheezing, eczema, a history of allergies, or past hospitalization for RSV infection but likely reflect infections other than RSV and environmental factors in subarctic indigenous populations.