Gram - rods, parasitize protozoa, opportunistic invaders of phagocytes, fastidious
Requires cysteine, low sodium, charcoal, and iron. Causes Legionnaires' disease and pontiac fever. Found in showers, humidifiers, wet places, etc. motile by monotrichous flagella, no capsule, oxidase +
Virulence factors of L. pneumophila
Endotoxin, prevents fusion of phagolysosome, has proteolytic enzymes, has b-lactamase, grows in 46C, chlorine resistant
Causes pontiac fever, discovered by McDade and Shepard
Affects all ages, doesn't produce pneumonia, and is never fatal.