An analysis was made of the incidence of pertussis in vaccinated children aged 2–9 years depending on the vaccines used (whole-cell pertussis vaccine, acellular pertussis vaccine or combination of vaccines) and the interval from the last dose of the vaccine. For an eight-year period (2012–2019), 3700 cases of pertussis were laboratory-confirmed, of which 1466 (39.6 %) were in children 2–9 years old with 871 (59.4 %) completely vaccinated in accordance with the national vaccination schedule (i. e. received 4 doses of the vaccine). Among the children with a full history of vaccination 791 out of 871 (90.8 %) were vaccinated with a whole-cell pertussis vaccine, 55 (6.3 %) – with acellular pertussis vaccine, 25 (2.9 %) – with both vaccines in different combinations. The frequency of use of different types of vaccines (whole-cell pertussis/acellular pertussis vaccine/both vaccines in different combinations) in the population of children was similar. The number of cases of pertussis among full vaccinated children increased with age and varied from 4.4 cases per year in 2-year-old children to 21.3 cases in 9-year-old children. The mean interval from the last vaccination was 5.20 (SD, 2.0) years for whole-cell vaccine, 3.35 (SD, 1.8) years for acellular vaccine and 3.58 (SD, 2.0) years for combinations of vaccines. This study indicates a decrease immunity to pertussis with age and the need for booster immunizations.
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