Immune responses to mosquito saliva in 14 individuals with acute systemic allergic reactions to mosquito bites - 24/08/11
, Andrew N. Beckett, BSc a, Renata J. Engler, MD b, Donald R. Hoffman, PhD c, Nancy L. Ott, MD d, F. Estelle R. Simons, MD, FRCPC a
Reprint requests: Zhikang Peng, MD, Department of Pediatrics and Child Health, University of Manitoba, 532-715 McDermot Ave, Winnipeg, Manitoba, Canada, R3E 3P4.Winnipeg, Manitoba, Canada, Washington, DC, Greenville, NC, and Edina, Minn
Abstract |
Background |
Mosquito bite–induced acute systemic allergic reactions are an increasing clinical concern and have not been optimally characterized immunologically.
Objective |
We wanted to study the immunologic basis of these reactions.
Methods |
Sera were received from 14 individuals with a history of acute systemic allergic reactions to mosquito bites, defined as the presence of one or more of the following: urticaria, angioedema, wheezing, dyspnea, hypotension, and decrease or loss of consciousness. Ten individuals were from the United States and one each was from Canada, Germany, Japan, and Switzerland. An indirect ELISA was developed to measure specific IgE and IgG antibodies to saliva from 5 common mosquito species with different geographic distributions: Aedes aegypti, Aedes vexans, Aedes albopictus, Anopheles sinensis, and Culex quinquefasciatus. Twenty-nine individuals with negative bite test results from laboratory-reared mosquitoes served as control subjects.
Results |
Mosquito saliva–specific IgE levels to all 5 species were significantly increased in the individuals with systemic allergic reactions compared with the control subjects (P < .061 for Aedes vexans and P < .008 for the remaining 4 species). By using the mean of the control subjects plus 1 SD as a cut-off level, 11 individuals had positive results to Aedes albopictus and up to 4 additional species; 3 individuals had positive results to only one species. Saliva-specific IgG levels were not significantly increased in the individuals with systemic allergic reactions compared with levels seen in the control subjects (P>.05).
Conclusion |
Acute systemic allergic reactions to mosquito bites involve mosquito saliva–specific IgE and can be characterized immunologically. Aedes albopictus is the most common species associated with systemic allergic reactions to mosquito bites.
Le texte complet de cet article est disponible en PDF.Key words : Acute systemic allergic reaction, Aedes aegypti, Aedes albopictus, Aedes vexans, Anopheles sinensis, anaphylaxis, angioedema, Culex quinquefasciatus, mosquito allergy, mosquito saliva-specific IgE
Plan
| Supported by the Children's Hospital Foundation of Manitoba, Inc, and the Paul H. T. Thorlakson Research Fund for Andrew Beckett's BSc medicine studentship. |
Vol 114 - N° 5
P. 1189-1194 - novembre 2004 Retour au numéro
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