Background. Thanks to vaccinations, many infections, including whooping cough, diphtheria, tetanus, poliomyelitis, measles, mumps, rubella, hepatitis B, hemophilic infection, pneumococcal infection, meningococcal infection, rotavirus infection, chicken pox, hepatitis A, papillomavirus infection, etc., can be prevented. According to the WHO research, it was established that if the level of vaccination coverage of the country's population drops by several percents, it creates favorable conditions for the spread of infectious diseases, that the lower the collective immunity, the higher the probability of outbreaks and epidemics. The Aim. Тo study and analyze the impact of risk factors on reducing the level of vaccine prophylaxis in the childhood population. Materials and Methods. This study was conducted using the questionnaire method, for which a questionnaire was developed. Group 1 consisted of 280 children who received a vaccination and group 2 consisted of 180 children who were not vaccinated. The parents of these children were interviewed using the author's questionnaire and gave their consent to use the medical data of the children for scientific research. Non-parametric statistical analysis for two independent sample populations was used to compare median values Mann-Whitney test. Fisher's test was used to compare proportions. Results. During the study, it was found that the most frequent reasons for parents' refusal to vaccinate their children were: religious views of family members 2.4 times increase the risk of non-vaccination in children; in single-parent families where the parents are divorced, children did not receive any vaccination 2.6 times more than in full-parent families; unfinished average of 35.7 times and lack of education 24.1 times increase the impact on the lack of vaccination in children. Conclusions. We identified the following risk factors that influence the vaccination rate, namely: demographic, socio-economic, biological and socio-psychological. Keywords: vaccine prevention, statistics, infectious diseases, risk factors.
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