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Are we really allergic to mosquito bites?

T Reunala1, H Brummer-Korvenkontio, T Palosuo

  • 1Department of Dermatology, University of Helsinki, Finland.

Annals of Medicine
|August 1, 1994
PubMed
Summary

Mosquito bite reactions are typically mild allergic responses, but rare systemic reactions can occur. Research shows specific IgE antibodies confirm allergic sensitization, while antihistamines may help manage symptoms.

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Area of Science:

  • Immunology
  • Allergology
  • Entomology

Background:

  • Most individuals develop sensitization to mosquito bites during childhood.
  • Cutaneous reactions include immediate wheal-and-flare and delayed papules, often worsening at the start of mosquito season.
  • Systemic reactions to mosquito bites are uncommon.

Purpose of the Study:

  • To confirm specific IgE antibody sensitization to Aedes communis mosquito saliva proteins.
  • To understand the immunological mechanisms behind immediate and delayed mosquito bite reactions.
  • To explore immune tolerance in populations with high mosquito exposure.

Main Methods:

  • Immunoblot studies to detect IgE antibodies against specific mosquito saliva proteins (22 and 36 kD).
  • Analysis of immune responses (IgE, IgG4) in populations from mosquito-infested areas.
  • Review of clinical manifestations and potential treatment options.

Main Results:

  • Specific IgE antibodies to Aedes communis saliva proteins were identified, confirming allergic sensitization.
  • Mosquito bite whealing is characterized as a type I allergic reaction.
  • Delayed papules may represent late-phase allergic reactions or type IV immune responses.
  • Populations in high-exposure areas like Lapland may develop tolerance, showing low IgE and high IgG4 anti-saliva antibodies.

Conclusions:

  • Specific IgE antibodies confirm allergic sensitization to mosquito saliva.
  • Immediate reactions are type I allergies, while delayed reactions involve eosinophils or type IV immunity.
  • Acquired tolerance in high-exposure areas is associated with specific antibody profiles (low IgE, high IgG4).
  • Antihistamines like cetirizine may offer symptomatic relief for mosquito bite reactions.

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