| Summary: | A.A. Girina1, F.I. Petrovsky 1 , Yu.A. Petrovskaya 1 , A.L. Zaplatnikov 2 1 Khanty-Mansiysk State Medical Academy, Khanty-Mansiysk, Russian Federation 2 Russian Medical Academy of Continuous Professional Education, Moscow, Russian Federation Aim: to assess the landscape of pneumococcus serotypes among children organized in kindergarten groups in Khanty-Mansiysk city. Patients and Methods: the study included 510 children (2-6 years old) attending kindergartens in Khanty-Mansiysk city. The children were divided into 2 groups: vaccinated (n=50) and non-vaccinated against pneumococcal infection (n=460). The data on vaccination status were received from the prophylactic immunization records (Form 063/u) and child's medical records (Form 112/u). In addition, the following data were analysed: age, gender, gestation age at birth, attitudes of child's legal representatives towards vaccinations, and the presence of chronic health problems. Pneumococcal polysaccharide conjugate adsorbed 13-valent vaccine (PCV-13) was used for the prevention of pneumococcal disease. Nasopharyngeal swabs were collected from children as a source of biological material. The pneumococcus was detected using a culture-based method and PCR assay. Results: the average age of organized children examined in Khanty-Mansiysk for Streptococcus pneumoniae (S. pneumoniae, pneumococcus) was 54.31 [53.46–55.16] months. In 56% of the examined children, pneumococcal DNA was found in nasopharyngeal swabs by polymerase chain reaction assay. The identified serotypes in 71.1% of cases were the same as in the PCV13 vaccine formulation. The most common serotypes detected were 4 (27%), 19 F (13.3%), 23 F (3.6%) and serogroup 6 (11.6%). In children immunized against S. рneumoniae, the pneumococcal strain DNAs, same as the vaccine strain DNAs, were found in 53.7% of cases, while in non-immunized children — in 73% of cases (OR 0.54, 95% CI 0.29–0.97). Conclusion: the increasing prevalence of S. рneumoniae carriage in children as they get older and attend organized ...
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