Large-scale antipneumococcal vaccination is followed by changes in the serotype composition and level of antibiotic resistance in pneumococci. The aim of the study was to evaluate the serotype composition and population pattern of pneumococci with lower susceptibility to penicillin before large-scale antipneumococcal vaccination. Among 260 Streptococcus pneumoniae strains isolated in the Russian Federation within 2003-2007, serotypes 23F (37.2%) and 19F (13.9%) were the most frequent ones. 19.3% of the isolates belonged to serogroup 6, 3.6% of the isolates each belonged to serotype 3 and serogroup 18, 4.9% of the isolates belonged to serotype 14 and 2.2% of the isolates belonged to serotype 19A. 66.8% of the isolates belonged to serotypes of the 7-valent conjugated pneumococcal vaccine, 67.3 and 82.1% of the isolates belonged to the 10- and 13-valent conjugated pneumococcal vaccines respectively. The isolates with lower susceptibility to penicillin were characterized by significant clonality and 56.9% of them belonged to 4 global clonal complexes (CC81, CC156, CC320 and CC315). Inclusion of the conjugated antipneumococcal vaccine to the National Vaccination Time-Table of the Russian Federation could promote lower levels of antibiotic resistance in pneumococci.
[Show abstract][Hide abstract] ABSTRACT: WHO recommends the inclusion of PCVs in childhood vaccination programs world-wide. Many countries including the Russian Federation are currently planning the inclusion of PCVs in their National Immunization Programs and, therefore, data on the pneumococcal serotype distribution is important to estimate the potential disease impact. Here we review eight recent epidemiological studies on the pneumococcal serotype distribution from Russia. Across all studies, serotypes 6B, 14, 19F and 23F were the most prevalent. Interestingly, serotype 3 was relatively common. Serotype 19A was prevalent among AOM, CAP and nasopharyngeal isolates and among antibiotic resistant isolates in all age groups. The differences in serotype coverage between PCV10 and PCV13 were up to 26%. Based on the current data on serotype distribution, a wide use of PCVs in Russia may lead to a significant reduction of the pneumococcal disease burden.
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