Allergies are the immune system's specific reaction to a normally harmless substance such as pollens, certain foods, or medicines. There are two main types, seasonal and perennial. The seasonal variety occurs at specific times of the year, while the perennial variety can happen year-round. In many cases, successful treatment involves medication, reducing contact with specific allergens, or shots. For videos and more check out http://www.emedtv.com/.
nice, clear and great graphics
eurica9 10 months ago
Thanks! More educational videos on Youtube!
lazzyJames 1 year ago
thanks so much! it really helped
MeAmNerd 1 year ago