Publication: Natural resolution of non-anaphylactic shrimp allergy in patients diagnosed 10 years earlier by oral food challenge
Issued Date
2021-12-01
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ISSN
22288694
0125877X
0125877X
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2-s2.0-85122972475
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Mahidol University
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SCOPUS
Bibliographic Citation
Asian Pacific Journal of Allergy and Immunology. Vol.39, No.4 (2021), 249-257
Suggested Citation
Suttipong Ittiporn, Surapon Piboonpocanun, Punchama Pacharn, Nualanong Visitsunthorn, Torpong Thongngarm, Orathai Jirapongsananuruk Natural resolution of non-anaphylactic shrimp allergy in patients diagnosed 10 years earlier by oral food challenge. Asian Pacific Journal of Allergy and Immunology. Vol.39, No.4 (2021), 249-257. doi:10.12932/AP-080119-0470 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/77128
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Title
Natural resolution of non-anaphylactic shrimp allergy in patients diagnosed 10 years earlier by oral food challenge
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Abstract
Background: Shrimp allergy is considered a lifelong condition. The natural resolution of shrimp allergy is not well studied. Objective: To investigate the natural resolution of shrimp allergy among a cohort of patients diagnosed with shrimp allergy 10 years earlier by oral shrimp challenge. Methods: A prospective study recruited patients diagnosed with shrimp allergy to Penaeus monodon (Pm), Macrobrachium rosenbergii (Mr), or both from a study conducted during 2005-2006. The current oral shrimp challenges were conducted during 2015-2016. The negative oral shrimp challenge was designated ‘resolved shrimp allergy’ (RSA), with a positive challenge designated ‘persistent shrimp allergy’ (PSA). Skin prick and prick-to-prick testing to shrimp were used to determine sensitization. Results: Sixty patients who had positive shrimp challenge from the previous cohort were contacted. Patients who had previous anaphylactic reaction (8 subjects) or allergic reaction after shrimp ingestion within 6 months (6 subjects), were not included. Nine patients refused to participate and 20 patients could not be contacted. Seventeen patients were included. Three were previously diagnosed with allergy to Pm, 3 to Mr, and 11 to both species. RSA was observed in 1 patient with isolated Pm allergy, and in 3 patients with isolated Mr allergy. Three of 9 patients with dual allergy had RSA to both species. RSA patients had significantly smaller size of shrimp skin test than PSA patients at both diagnosis and follow-up. Conclusions: At ten years after diagnosis, 46% of patients had RSA. These patients had significantly smaller size of shrimp skin test than PSA patients.