bacteria, virus, microbe dark seamless pattern. background included line icons as microorganism, germ, mold, cell

background bacteria bacterial bacteriophages bacterium biology cell chemical color contaminants culture dark disease flat germ germs gut health hygiene icon illustration immune infection laboratory line medical medicine micro microbe microbiology microorganism mold organism outline pandemic pathogen pattern petri pictogram pollen probiotic repeat research science seamless symbol vector virus wallpaper white