Aetna Intelihealth
Aetna: Inteli Health: Types of Allergies
Insightful article that categorizes and describes the various types of allergies. Also gives information on treatment of symptoms.
WebMD
Web Md: Airborne Allergens
This site from WebMD Health provides an article entitled, "Something in the Air: Airborne Allergens". Includes detailed information on why some people are allergic to certain substances, while others are not. Symptoms of airborne...