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Published online by Cambridge University Press: 02 January 2015
We analyzed 333 isolates of Streptococcus pneumoniae from adult inpatients over a continuous 30-month period. Twenty-five percent of isolates were resistant to penicillin, and 18% of tested strains were not susceptible to ceftriaxone. For 29 (15%) of 199 evaluable patients, S pneumoniae was isolated from a culture first obtained >48 hours after admission, and chart review satisfied our case definition for nosocomial infection. S pneumoniae isolates were penicillin-resistant in 14 of 29 nosocomial and 34 of 170 community-acquired cases (odds ratio, 3.73; 95% confidence interval, 1.53-9.15; P =.01)