Monkeypox (Mpox) is a rare viral disease that is similar to smallpox but is less severe. It was first identified in 1958 when outbreaks occurred in monkeys kept for research. The disease is caused by the monkeypox virus, which is a member of the orthopoxvirus genus, the same genus as the smallpox virus. Symptoms include fever, swollen lymph nodes, and a rash that forms blisters and then crusts over. The time from exposure to onset of symptoms ranges from five to twenty-one days. The duration of symptoms is typically two to four weeks.
Mpox, which used to be called monkeypox, is a rare disease caused by infection with the mpox virus. The mpox virus is in the same family of viruses as the smallpox virus. But mpox is less contagious than smallpox. And its disease causes milder symptoms and is usually not fatal.