A widespread disease that affects many individuals in a population.
An occurrence of a disease or disorder in a population at a frequency higher than that expected in a given time period; an episode of outbreak and subsequent high prevalence.
The spreading of an idea or belief amongst a population.
Like or having to do with an epidemic; widespread.
Either of the two related viruses, human immunodeficiency virus 1 (HIV-1) and human immunodeficiency virus 2 (HIV-2) that progressively destroy the body's immune system and can potentially lead to AIDS.