Q. How a person be allergic to mosquitoes?
A. Symptoms may occur up to 48 hours after the initial bite. According to the American Academy of Allergy, Asthma, & Immunology (AAAAI), contact with a mosquito must be six seconds or longer to produce a reaction. Symptoms of a more severe allergic reaction may include: ... hives (at or around the bite) silver colored items to wear of the evening