The worldwide spread is worrisome. "We're not used to seeing that with monkeypox," said Jason Kindrachuk, a University of Manitoba associate professor of viral pathogenesis and Canada Research Chair in emerging viruses who has studied monkeypox. "In general, the entire community is susceptible," Instances of monkeypox in humans have been reported outside of Africa, and have been connected to foreign travel or imported animals, including cases in the United States, Israel, Singapore, and Britain. Monkeypox is an uncommon illness caused by monkeypox viral infection. Monkeypox virus is a member of the Orthopoxvirus genus in the Poxviridae family. Variola virus (which causes smallpox), vaccinia virus (used in the smallpox vaccine), and cowpox virus are all members of the Orthopoxvirus genus. This week, British health officials took a brave step by offering smallpox immunizations concerned about the monkeypox symptoms, whi...