Allergies are nothing to sneeze at. According to the National Institute of Allergy and Infectious Disease, between six and eight percent of all children suffer from one type or another of food allergy. This is of course no news to teachers who can't let their kids eat anything made with eggs or wheat, parents who can't pack their son or daughter a peanut-butter sandwich, or any pediatrician who consults with an allergist on an almost daily basis. These links offer authoritative information on different types of allergies.
AAP's Asthma and Allergy page: http://www.aap.org/healthtopics/asthma.cfm
From the American Academy of Pediatrics.
Alergias alimentarias: sólo los hechos: http://familydoctor.org/online/famdoces/home/common/allergies/basics/340.printerview.html
An information guide from the American Academy of Family Physicians, in Spanish.
Allergy testing: http://www.labtestsonline.org/understanding/analytes/allergy/test.html
From Lab Tests Online.
From the American College of Allergy, Asthma, and Immunology.
From the American Lung Association.
Bee or yellowjacket Sting: http://www.thechildrenshospital.org/wellness/at_home/skin/sting.aspx
From Aurora, Colorado's Children's Hospital.
Celiac disease: http://www.digestive.niddk.nih.gov/ddiseases/pubs/celiac/
From the National Institute of Diabetes and Digestive and Kidney Diseases.
Drug allergy: http://www.hmc.psu.edu/healthinfo/d/drugallergy.htm
From the Penn State Milton S. Hershey Medical Center School of Medicine.
Dust mites: http://www.childrenshospital.org/az/Site809/mainpageS809P0.html
From Children's Hospital Boston.
From Ohio's Akron Children's Hospital.