Serotype distribution and antimicrobial resistance of Streptococcus pneumoniae prior to introduction of the 10valent pneumococcal conjugate vaccine in Brazil, 2000–2007

Abstract

This study describes the serotype distribution and antibiotic resistance patterns among 397 S. pneumoniae meningitis case isolates recovered in Salvador, Brazil, during the period of 2000–2007, before introduction of the 10valent pneumococcal conjugate vaccine. The active hospitalbased surveillance showed a decline in the annual incidence rates of pneumococcal meningitis during the period of study, from 1.12 cases to 0.83 cases/100,000 persons for all age groups (P < 0.001), with an overall casefatality rate of 28.6% (113 of 395) for all patients and 41.9% (57 of 136) for those <5 years of age. Serotypes 14 (n = 55; 13.9%), 3 (n = 32; 8.1%), 23F (n = 32; 8.1%), 19F (n = 31; 7.8%), 6B (n = 30; 7.6%), 18C (n = 28; 7.1%), and 6A (n = 20; 5%) were the most prevalent serotypes. In patients <5 years the estimated projected coverage of 7, 10and 13valent conjugate vaccines was 74.3%, 75.7% and 83.1%, respectively. Antimicrobial susceptibility testing revealed that 22.1% (n = 88) of isolates were nonsusceptible to penicillin, 56% were nonsusceptible to trimethoprim/sulphamethoxazole, and 29.6% were nonsusceptible to tetracycline. Nonsusceptibility to penicillin and cefotaxime was detected solely among serotype 14 isolates (n = 4; 1%). This study provides an important baseline to assess the impact of conjugate vaccine implantation on the epidemiology of meningitis due to Streptococcus pneumoniae in Salvador, Brazil.