For Bacteria (Singular: Bacterium) we have terms and definitions in 2 topics. The topics are Animal Health and HIV and AIDs.

Any of a large group of microscopic organisms that live in soil, water, plants, organic matter, or the live bodies of animals or people. Bacteria are single-celled organisms that live in and around us. Bacteria may be helpful, but in certain conditions may cause illnesses such as strep throat, most ear infections, and bacterial pneumonia.
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Unicellular prokaryotic organisms that reproduce by cell division; usually have cell walls; can be shaped like spheres, rods or spirals; and can be found in virtually any environment.
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