Conditions list medically reviewed by George Krucik, MD, MBA
Learn about the causes and symptoms of the West Nile virus.
Poliomyelitis, or polio, is a highly contagious disease that is caused by a virus that attacks the body's nervous system.
A transfusion reaction is when your body has an adverse response to a blood transfusion. Learn how transfusion reactions occur and how to minimize your risk.
Smallpox is an extremely contagious and deadly virus for which there is no known cure. This disease has been completely eradicated.
This feature is for informational purposes only and should not be used to diagnose. Please consult a healthcare professional if you have health concerns.