Havrix

Hepatitis A vaccine is a vaccine that prevents hepatitis A.[1] It is effective in around 95% of cases and lasts for at least twenty years and possibly a person's entire life.[2] If given, two doses are recommended beginning after the age of one.[1] It is given by injection into a muscle.[1] The first hepatitis A vaccine was approved in Europe in 1991, and the United States in 1995.[3] It is on the World Health Org... [wikipedia]