| Agent |
Population |
| 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 |
mr. charles11
