viruses and parasites in the organism. germs and bacteria. pathogenic environment.

allergy antiseptic antiviral bacteria bacterium biohazard biology caricature cartoon character contagion coronavirus covid19 creature disease enteric enterobacteria environment epidemic flu germ germs health hygiene illness illustration infection intestinal intestine micro microbe microbial microbiology microflora microorganism microscope microscopic monster organism parasite parasites pathogen pathogenic pattern research science staphylococcus symptoms vaccine vector virology virus viruses