Anaerobic pneumonia/lung abscess
Usually polymicrobial: Anaerobes: Bacteroides sp. (15% B. fragilis ), Peptostreptococcus, Prevotella sp., Porphyromonas sp., Fusobacterium sp., micro-aerophilic streptococcus, veillonella, and facultative anaerobes; S. aureus, P. aeruginosa, S. pneumoniae (rare), Klebsiella (rare), H. influenzae type B, legionella, nocardia, actinomyces, fungi, parasites.
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