B virus, also known as herpes B virus or herpesvirus simiae, is a common infection in macaques, usually causing asymptomatic or mild disease.
Infections in humans are extremely rare, but when they occur, they usually come from macaque encounters and are often severe and deadly.
The US Centers for Disease Control and Prevention estimates that about 70 percent of untreated B virus infections in humans are fatal.
The virus was discovered in 1932, and since then only 50 human infections have been documented as of 2019, with 21 resulting in death.
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