Licensed from

Antigen Health Article

Send

Definition

Images

Human Leukocyte Antigen Test
Gale Encyclopedia of Nursing and Allied Health

Health Search

Drug Search

Explore and compare medications

Definition

An antigen is any substance that causes your immune system to produce antibodies against it. An antigen may be a foreign substance from the environment such as chemicals, bacteria, viruses, or pollen. An antigen may also be formed within the body, as with bacterial toxins or tissue cells.

Review Info

David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. , 08/10/2009

Follow Yahoo! Health on Twitter and become a fan on Facebook

Follow @YahooHealth on Twitter

Health Videos

Most Common Conditions
Acne Allergies Anxiety Arthritis Asthma ADHD Bipolar Disorder Breast Cancer	Depression Diabetes GERD High Blood Pressure Menopause Migraine Multiple Myeloma Osteoarthritis	Pregnancy Prostate Cancer Sleep Disorders Stroke 3D Body Maps Health Experts News Videos

Antigen Health Article

Drug Search

Definition

Review Info

Specialty drug costs a major employer worry: survey

Many pregnant women may not get STD tests

Sex, age may affect athletes' concussion recovery

More on YAHOO! Health

Also on YAHOO!

Most Common Symptoms
Abdominal Pain Back Pain Blood In Stool Chest Pain Cough Dark Urine Diarrhea Dizziness Fatigue Fever Frequent Urination	Gas Headache Joint Pain Loss of Appetite Low Grade Fever Nausea Rash Swollen Feet Vaginal Discharge Vertigo