Invasiveness of serotypes and clones of Streptococcus pneumoniae among children in Finland

被引:123
作者
Hanage, WP
Kaijalainen, TH
Syrjänen, RK
Auranen, K
Leinonen, M
Mäkelä, PH
Spratt, BG
机构
[1] Univ London Imperial Coll Sci Technol & Med, St Marys Hosp, Dept Infect Dis Epidemiol, Fac Med, London W2 1PG, England
[2] Natl Publ Hlth Inst, Dept Microbiol, Natl Reference Lab Pneumococcus, Oulu, Finland
[3] Natl Publ Hlth Inst, KTL, Dept Vaccines, Helsinki, Finland
关键词
D O I
10.1128/IAI.73.1.431-435.2005
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Streptococcus pneumoniae (the pneumococcus) causes diseases from otitis media to life-threatening invasive infection. The species is extremely antigenically and clonally diverse. We wished to determine odds ratios (ORs) for serotypes and clones of S. pneumoniae that cause invasive disease in Finland. A total of 224 isolates of S. pneumoniae from cases of invasive disease in children <2 years of age in Finland between 1995 and 1999 were serotyped, and sequence types (STs) were determined by multilocus sequence typing. These STs were compared with a previously published carriage data set. STs from invasive disease were significantly less diverse than those from carriage (invasive disease, 0.038 +/- 0.01; carriage, 0.019 +/- 0.005). The ORs of serotypes 14, 18C, 19A, and 613 were significantly greater than 1, indicating association with invasive disease. The ORs of 6A and 11A were significantly less than 1. The difference between 6A and 613 is significant, which suggests that relatively subtle changes in the capsule may have a dramatic effect upon disease potential. We found that ST 156, the Spain(9v)-3 clone which mainly expressed serotype 14 in Finland, is strongly associated with invasive disease (OR, 10.1; 95% confidence interval, 1.3 to 79.5). Significant associations with invasive disease were also detected for STs 482, 191, 124, and 138, and associations with carriage were detected for STs 485 and 62. These results demonstrate the invasive phenotype of the serotype 14 variant of the Spain(9v)-3 clone and differences between members of the same serogroup in invasive disease potential.
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页码:431 / 435
页数:5
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