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cells."}]}]},{"type":"listItem","content":[{"type":"paragraph","attrs":{"textAlign":null},"content":[{"type":"text","marks":[{"type":"bold"}],"text":"Pathogens"},{"type":"text","text":": Microbes that cause disease."}]}]},{"type":"listItem","content":[{"type":"paragraph","attrs":{"textAlign":null},"content":[{"type":"text","marks":[{"type":"bold"}],"text":"Opportunistic pathogens"},{"type":"text","text":": Normally harmless microbes that cause disease under certain conditions (e.g., weakened immunity)."}]}]},{"type":"listItem","content":[{"type":"paragraph","attrs":{"textAlign":null},"content":[{"type":"text","marks":[{"type":"bold"}],"text":"Golden Age of Microbiology"},{"type":"text","text":": Period (mid-1800s to early 1900s) marked by major discoveries in microbiology, including the development of germ theory and aseptic 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