bacteria and germs colorful set micro-organisms disease-causing objects, bacteria, viruses, fungi. cartoon

virus bacteria microbiology organism science bacterium biology infection illness microbe micro microscopic pathogen medicine microorganism flat illustration disease medical germ cell bacillus bug pandemic cartoon epidemic hiv color superbug ebola vector mold icon human background sick allergen health isolated ill contaminants danger set collection symbol sign germs colorful micro-organisms disease-causing objects viruses fungi microbes biological icons