An allergy can be caused by
antigens Pesticides cold weather fever viruses food Smoking germs
A B C D E F G H
An allergy is a reaction to a substance the body recognizes as foreign.
Antigens are molecules that can cause an allergy
An allergy can be caused by (A) antigens (B) Pesticides (C) cold weather (D) fever (E) viruses (F) food (G) Smoking (H) germs