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Definition Legionellosis refers to two clinical syndromes caused by Legionella bacteria: pneumonia and Pontiac fever. Legionella pneumonia (legionnaires disease) can be episodic or occur in outbreaks, and it can be acquired in the community or in health care settings. Pontiac…
Infectious diseases have profoundly influenced the human genome and the course of human history. As of early 2023, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2; Chapters 335 to 337 ) infection has caused nearly 7 million deaths worldwide. Beginning in…