New Outbreak of Monkeypox Virus: WHO Declares the Outbreak a Global Health Emergency Monkeypox is a viral zoonotic disease caused by monkeypox virus. Monkeypox virus is an enveloped double-stranded DNA virus from the Ortho-poxvirus genus of the family Poxviridae, which also includes the variola virus which causes smallpox, the vaccinia virus, which was used for...