Biology / Bio 1965 · Atom · ~20 seconds
Bacterial Disease Mechanism, Overview
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A pathogenic bacterium causes disease by damaging tissue, releasing toxins, or triggering a harmful immune response, not by any single shared mechanism.
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Some bacteria damage tissue by direct invasion; Clostridium botulinum instead causes illness mainly through a released toxin.
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Only a small fraction of prokaryotes are pathogens — most bacterial species cause no disease in humans.