hand drawn smallpox virus on white background. realistic detailed scientifical in sketch stile

smallpox variola virus othopoxvirus monkey monkeypox pox sketch bacteria pen science cell microscope vector symbol white black pandemic infection icon disease ink pencil anatomy danger biology organism molecule scientific human illness hand drawn bacterium draw vintage isolated cut engraving microorganism microbe medical microscopic line art germ realistic microbiology pathogen background detailed scientifical stile background stile