The good news is that hepatitis A can be prevented by vaccination. A variety of vaccines are available to make immunization fit your needs. The vaccine will prevent you from contracting hepatitis A and from being a potential source of infection to others.epatitis B is another form of liver disease caused by a virus that attacks the liver. The hepatitis B virus is 100 times more contagious than the virus that causes AIDS. It is spread through infected blood or body fluids or by sexual contact with an infected person.