MeSH definition : A species of ORTHOPOXVIRUS causing infections in humans. No infections have been reported
since 1977 and the virus is now believed to be virtually extinct.;
A species of ORTHOPOXVIRUS causing infections in humans. No infections have been reported
since 1977 and the virus is now believed to be virtually extinct.
https://apps.who.int/iris/handle/10665/339332 2021 false false false Switzerland journal article epidemiology Smallpox Epidemiologists Epidemiology variola virus Viruses world health organization Researches advisory committees research variola virus Epidemiology Epidemiology Epidemiology Epidemiology epidemiologic research design Virus