virus, bacteria, cell infected organism, virus abstract background. . concept of medicine and science.

abstract aids bacillus background bacteria bacterial bacteriology bacterium biological biology blue body cancer cell closeup concept contagious diarrhea digitally disease disorder encephalitis entering epidemic gastroenteritis generated genetic germs graphic health hepatitis heredity human illness illustration infection infectious laboratory lactobacillus life macro medical medicine microbe microbes microbiology microflora microorganism microorganisms microscope microscopic molecules mycobacterium organic organism outbreak pathogenic pathogens pathology prebiotic pretrials render research retrovirus salmonella science scientific sick sickness spore streptobacilli streptobacillus subtilis thuringiensis transmit unhygienic virus