Mpox Virus

This fact sheet discusses how mpox is a rare but potentially serious disease that is caused by the mpox virus. The mpox virus is from the same family of viruses as the smallpox virus. The symptoms of mpox are similar to smallpox symptoms, but are less severe. It is also less transmissible than smallpox, and rarely fatal. The mpox virus can spread from infected humans, animals, and materials contaminated with the virus. The mpox virus is characterized by a new unexplained rash and skin lesions.