Types of pneumonia
Community Acquired: Streptococcus pneumoniae, Mycoplasma, Chlamydia, Legionella
Nosocomial (two-thirds of all cases are elderly) Streptococcus, S. aureus, anaerobes, GNB, Pseudomonas, MRSA, Enterococcus.
Nursing Home: More GNB, H.influenzae, and multi-resistant organisms, anaerobes from aspiration.