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Pneumonia Causes

Specific causes of pneumonia in specific populations

AgentPopulation
Haemophilus influenza Smokers, COPD
Mycoplasma Young, otherwise healthy patients
Legionella Epidemic infection in older smokers, particularly when located near infected water sources, such as air-conditioning systems
Pneumocystis jiroveci (formerly carinii) pneumonia HIV-positive persons with <200 CD4 cells not on prophylaxis.
Coxiella burnetti (Q-fever) Exposure to animals, particularly at the time they are giving birth
Klebsiella Alcoholics
Staphylococcus aureus Following viral syndromes or viral bronchitis, especially influenza
Coccidioidomycosis Exposure to the deserts of the American Southwest, particularly Arizona
Chlamydia psittaci Exposure to birds
Histoplasma capsulatum Exposure to bat or bird droppings, spelunking (recreational cave exploration)
Bordetella pertussis Cough with whoop and post-tussive vomiting
Francisella tularensis Hunters, or exposure to rabbits
SARS, Avian injluenza Travel to Southeast Asia
Bacillus anthracis, Yersinia pestis, and Francisella tularensis Bioterrorism
Created by: Bijan39