viruses seamless patten. scientific hand drawn in sketch style. microscopic microorganisms

seamless pattern coronavirus influenza flu covid adenovirus papillomavirus hpv sketch virus bacteria plague science cell microscope vector symbol white black pandemic infection hiv disease herpes pencil ebola danger biology organism bacteriophage molecule human illness hand drawn bacterium draw vintage engraving microorganism microbe microscopic germ realistic microbiology pathogen background design viruses patten scientific style microorganisms patten style microorganisms