Both terms are related to microbiology and refer to microscopic organisms. Both can cause diseases in humans and other living organisms.
Germ is a broad term that can refer to bacteria, viruses, fungi, or other microorganisms, while bacterium specifically refers to a single microscopic cellular organism that belongs to the domain Bacteria. Germ is often used in a more general context, sometimes referring to anything that causes disease, whereas bacterium is a scientific term used to classify and describe specific types of microorganisms.
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