Table 57.4.

Important environmental factors in respiratory tract infections

Pneumonia
Anthrax	Biological war; exposure to cattle
Melioidosis	Travel to endemic areas
Brucellosis	Exposure to cattle
Plague	Travel to endemic areas and contact with rats
Tularemia	Hunting or other exposure to wild animals
Psittacosis	Exposure to birds
Leptospirosis	Adventurous travel
Coccidioidomycosis	Travel to endemic areas
Histoplasmosis	Exposure to bat droppings
Q fever	Exposure to infected animals
Legionnaires' disease	Ship trip or enclosure in epidemic foci
Hantavirus	Exposure to rodents
Pharyngitis
Diphtheria	Travel to epidemic countries