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This is the first time that monkeypox , a smallpox-related virus usually found in Africa, has infected humans in the United States.
Today monkeypox is not spreading fast, but the slow decline of immunization to smallpox may nudge monkeypox up into the breakout zone.
Just this year, exotic animals smuggled from Africa infected American prairie dogs, which then affected humans with so-called monkeypox ; 37 cases were confirmed.
The world has recently seen an emergence or re-emergence of infectious diseases such as smallpox, SARS, West Nile virus, and monkeypox .
Smallpox vaccine has been reported to reduce the risk of monkeypox among previously vaccinated persons in Africa.