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Trends in antimicrobial susceptibility of bacterial pathogens isolated from pediatric and adult patients with blood stream infections in North America SENTRY 1997-2000



Trends in antimicrobial susceptibility of bacterial pathogens isolated from pediatric and adult patients with blood stream infections in North America SENTRY 1997-2000



Abstracts of the General Meeting of the American Society for Microbiology 101: 227-228



From January 1997 through December, 2000, 25,747 BSI due to bacterial pathogens were reported from SENTRY hospitals in Canada and the USA. S. aureus, E. coli, and coagulase-negative staphylococci (CoNS) were the most common pathogens, together accounting for 55% of all BSI pathogens during this time period. Among the four different age groups (<1 yr, 1-5 yr, 6-18 yr, and >18 yr) the most common BSI pathogen was CoNS (<1 yr), S. pneumoniae (1-5 yr), and S. aureus (6-18 yr and >18 yr). Fourteen key organism:antimicrobial agent combinations were evaluated for differences in antimicrobial susceptibility among the various age group categories. No significant differences were observed among the 4 age group categories for E. coli and ceftazidime (98-100% susceptible), cefepime (99-100%) and ciprofloxacin (97-100%); Klebsiella spp. and ceftazidime (89-98%) and cefepime (96-100%); P. aeruginosa and ceftazidime (83-90%); Enterobacter spp. and ceftazidime (72-78%) and cefepime (97-100%). Isolates causing BSI in patients <1 yr were less susceptible than those isolated from patients >18 yr for CoNS and oxacillin (19% susceptible vs. 28%) and S. pneumoniae and penicillin (74% vs 84%). Isolates causing BSI in patients <1 yr were more susceptible than those isolated from patients >18 yr for S. aureus and oxacillin (80% susceptible vs. 70%); Enterococcus spp. and vancomycin (100% vs. 85%); P. aeruginosa and cefepime (94% vs. 88%) and imipenem (96% vs. 90%). These data demonstrate differences in the spectrum of pathogens and in antimicrobial resistance among the pediatric and adult age groups in North America. Antimicrobial resistance was especially pronounced among the Gram-positive pathogens. Ongoing surveillance remains essential and will enhance efforts to limit the extent of resistance among the various age groups.

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