Legionellosis

Pneumonia from air-conditioning and water systems, named after a 1976 convention. Atypical pneumonia with hyponatremia and GI symptoms, grows on BCYE agar.

Key facts

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Legionella multiplies inside free-living amoebae in water systems using the same machinery it later uses to hijack human alveolar macrophages — it essentially 'practises' on protozoa for millions of years before ever meeting a person. A bacterium with no need for humans ends up thriving inside the very immune cells sent to destroy it.

Next: Leishmaniasis

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