Conditions list medically reviewed by George Krucik, MD, MBA
Swine flu, or H1N1, is highly contagious and can spread quickly from person to person. A simple sneeze may cause thousands of germs to spread through the air.
If left untreated, HIV can lead to AIDS. AIDS weakens your immune system to the point where it can no longer fight off disease and infection. Learn more.
Learn about the causes and symptoms of the West Nile virus.
This feature is for informational purposes only and should not be used to diagnose. Please consult a healthcare professional if you have health concerns.