Any one of several forms of a disease causing inflammation of the liver. Types A-G are caused by viruses. Vaccines exist for Hepatitis A (usually caused by food contaminated with feces containing the virus) and Hepatitis B (usually spread by sex with an infected partner or the sharing of needles with an infected person).
Glossary of Terms
Common terms that you may encounter on the site.
Indirect protection against disease that results from a sufficient number of individuals in a community having immunity to that disease. With enough immune individuals, the transmission of a disease can be reduced, thus limiting the potential for any one individual to be exposed to it. Herd immunity does not apply to diseases, such as tetanus, that are not spread via person-to-person contact.