Bacteria - Single-celled microorganisms that can cause disease (pathogenic) or be harmless (non-pathogenic), Viruses - Microscopic infectious agents that require a host cell to replicate and cause disease, Microbe - A general term for microorganisms, including bacteria, viruses, fungi, and parasites, Pathogen - Any microorganism, such as bacteria, viruses, or fungi, that can cause disease, Fomite - An inanimate object that can carry and spread infectious agents, such as doorknobs or medical equipment, Prion - Infectious protein particles that can cause neurodegenerative diseases,

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