norovirus on white background. hand drawn realistic detailed scientifical in sketch style

norovirus norwalk gastroenteropathy calicivirus rnk vomit stomach flu gastroenteritis diarrhea sketch virus bacteria pen science cell microscope vector symbol white black pandemic infection icon disease ink pencil anatomy danger biology organism molecule human illness hand drawn bacterium draw vintage isolated engraving microorganism microbe medical microscopic line art germ microbiology pathogen background realistic detailed scientifical style background style