What is Hepatitis C? (WebMD)
This infection of the liver is caused by the hepatitis C virus. About 3.9 million people in the U.S. have the disease. But it causes few symptoms, so most of them don't know. There are many forms of the hepatitis C virus. The most common in the U.S. is type 1. None is more serious than any other, but they respond differently to treatment.
