Active immunization against HAV infection in subjects at risk of exposure to HAV. In areas of low to intermediate prevalence of hepatitis A, immunization w/ Havrix is particularly recommended in subjects who are, or will be, at increased risk of infection eg, travelers, armed forces, persons for whom hepatitis A is an occupational hazard or for whom there is an increased risk of transmission (employees in day-care centres, nursing, medical & paramedical personnel in hospitals & institutions, especially gastroenterology & paed units, sewage workers, food handlers, among others), persons at increased risk due to their sexual behavior, haemophiliacs, abusers of injectable drugs, contacts of infected persons, persons who require protection as part of hepatitis A outbreak control, specific population groups known to have a higher incidence of hepatitis A (American Indians, Eskimos, recognised community-wide HAV epidemics), subjects w/ chronic liver disease or who are at risk of developing chronic liver disease (eg, hepatitis B & hepatitis C chronic carriers & alcohol abusers).