Infectious disease | Definition, Types, & Causes | Britannica
https://www.britannica.com/science/infectious-disease
WEBApr 11, 2024 · Infectious disease, process caused by an agent, often a microorganism, that impairs a person’s health. Infectious diseases typically are caused by bacteria, viruses, fungi, or parasites. The immune system generally reacts quickly against these agents, though drugs may be used to help fight off infection.
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