Mpox, previously known as monkeypox, is an uncommon disease caused by the mpox virus. Mpox virus is in the same family of viruses as the variola virus that causes smallpox.
Prior to 2022, mpox was spread mostly through contact with certain animals. During the global mpox outbreak that began in May of 2022 we saw mpox mostly spread through close physical contact between people. Some populations were affected more than others, including gay, bisexual, and other men who have sex with men who had recent contact with a new partner or partners.