What organism is associated with the highest mortality rate for patients with pneumonia?
a. Klebsiella
b. Legionella
c. Pseudomonas aeruginosa
d. Staphylococcus aureus
ANS: C
Mortality varies according to the infecting agent and was highest for P. aeruginosa (61.1%), Klebsiella species (35.7%), Escherichia coli (35.3%), and S. aureus (31.8%). Mortality rates for more common pathogens were lower but still substantial and included Legionella species (14.7%), S. pneumoniae (12.3%), C. pneumoniae (9.8%), and M. pneumoniae (1.4%).
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