types of microorganisms. bacteria, fungi, one-celled eukaryote, and protist

albicans amoeba anatomy bacillus bacteria bacterial bacterium bifidobacterium biology candida cell celled classification clostridium collection danger disease education element epidemiology eukaryote flora flu fungi fungus germ germs health human hygiene icon illness illustration immune infection influenza isolated living medical medicine micro microbe microbiology microorganism microorganisms microscopic not one organism pathogen pathogenic pathogens probiotic probiotics protist science set staphylococcus streptococcus toxoplasma types vector virus viruses yeast