a man with smallpox disease and close-up view of variola virus, a virus from orthopoxviridae family that causes smallpox

smallpox immunity immunization infection injection macro major medical medicine microbe microbiology microorganism orthopoxviridae poxviridae structure vaccination vaccine virion illustration healthcare virus variola 3d orthopoxvirus poxvirus disease viral human contagious virology closeup epidemic monkeypox monkey pox microscope microscopic magnification microscopy cowpox vaccinia tanapox molluscum contagiosum man face boils skin rash lesion