1.   First it was the different forms of hepatitis virus which caused alarm.

2.   There are at least five types of hepatitis caused by different hepatitis viruses.

3.   Of the latter, all were positive for antibody against hepatitis delta virus and had hepatitis delta virus antigen detectable in the liver.

4.   Most HIV-positive intravenous drug users are also infected by hepatitis C virus.

5.   And, so far, doctors have not found any trace of the hepatitis virus in his body.

6.   Another infectious agent, mouse hepatitis virus, is yielding still other clues.

7.   Both heavy drinking and the hepatitis virus cause cirrhosis, or scarring, of the liver.

8.   A newly identified, potentially deadly strain of the hepatitis virus is circulating among American blood donors.

9.   A research scientist has provided the first glimpse into a kind of fatal hijacking that occurs at the molecular level of the hepatitis C virus.