食用コオロギ摂取によりアレルギー症状を呈した幼児例

Muneo Minoshima, Mai Tokunaga, Yumi Koike, Yasunori Ito

In recent years, the consumption of edible insects has gained attention, and the potential allergic risks associated with their ingestion have been pointed out, though there are limited case reports. A 3-year-old boy exhibited an immediate allergic reaction, showing symptoms of sneezing, nasal discharge, coughing, and eyelid edema after ingesting two cricket crackers. He had previously consumed shrimp but had never eaten edible insects. Given his lack of a history of allergic diseases, the onset of this allergy was unexpected. Subsequent prick tests and oral food challenge tests confirmed that the Two-spotted cricket (Gryllus bimaculatus) was the allergen responsible for his symptoms. The IgE inhibition test indicated that the cricket significantly suppressed the specific IgE levels for moth, shrimp, and mite (Dermatophagoides pteronyssinus). This incident marked the first time in the patient's life that he exhibited allergic symptoms, and it serves as a significant case highlighting the risks of allergies from edible insects. Known allergens in insects include tropomyosin and arginine kinase, which are common in arthropods, but there are reports of other allergens as well, suggesting potential sensitization from cross-reactions. As the consumption of insects becomes more widespread, the number of allergic cases may increase, and food labeling and preventive measures should be considered.