a man with smallpox disease

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