Abstract
Monitoring of serotypes and their clonal associations is critical as pneumococci adapt to the selective pressures exerted by the pneumococcal seven-valent conjugate vaccine (PCV7). We genotyped 1,476 invasive isolates from the Active Bacterial Core surveillance (705 [89.8%] of the isolates were obtained from children <5 years of age, and 771 [18.4%] of the isolates were obtained from individuals >5 years of age) in 2001 and 2002 (after the introduction of PCV7). The data were compared to the results for 1,168 invasive isolates (855 [83.9%] of the isolates were from children <5 years of age) collected in 1999. Among children <5 years of age, the incidence of invasive disease due to non-PCV7 serogroups together with serogroup 19A increased (P < 0.001). Eighty-three clonal sets, representing 177 multilocus sequence types (STs), were compiled from the 3-year isolate set. Among the non-PCV7 serogroups, newly emerging clones were uncommon; and a significant expansion of already established clones occurred for serotypes 3 (ST180), 7F (ST191), 15BCF (ST199), 19A (ST199), 22F (ST433), 33F (ST662), and 38 (ST393). However, additional minor clonal types within serotypes 1, 6A, 6B, 7C, 9N, 10A, 12F, 14, 15B/C, 17F, 19A, 19F, 20, 22F, and 3...Continue Reading
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