Objective: to study the seroprevalence of SARS-CoV-2 antibodies (AB) in children in the 2nd year of the COVID-19 pandemic in Russia. Materials and methods: prospective cohort study. The seroprevalence research was conducted among 3670 children aged 1 to 17 y/o from 26 modelling regions of Russia (that have been participating earlier in the five stages of seromonitoring during 2020-2021). The serological testing was carried out in December, 2021. The work was carried out according to a unified methodology set by the Russian Federal Service for Supervision of Consumer Rights Protection and Human Well-Being with the Pasteur Institute of Epidemiology and Microbiology (Saint Petersburg, Russia). The plasma was obtained from 3 ml of venous blood, in which the level of AB to nucleocapsid (NC), and the SARS-CoV-2 receptor-binding domain (RBD) was determined by immunoferment method using reagents for qualitative and quantitative analysis. Results: the analysis of AB seroprevalence to NC and RBD showed the statistically significant increase in the share of seropositivity to RBD in children of all modelling regions (p<0.05). The most seropositive volunteers contained low levels of AB: 31.3-125.6 BAU/ml NC and 22.6-220 BAU/ml RBD. An increase in the level of AB to NC and RBD was accompanied by a decrease in the percentage of seropositive patients. Evaluating the contribution of children to the level of humoral immunity, convalescents (had been ill shortly before the examination), the “anamnesis” (had been ill at previous stages of seromonitoring) and asymptomatic (had been asymptomatically ill) groups were distinguished. The maximum contribution was made by children with asymptomatic cases of COVID-19 in anamnesis: in 82.3% (95% CI 81.1-83.6), of which 76.9% (95% CI 75.5-78.3) AB detected to RBD. The contribution of children of two other groups to the overall level of humoral immunity was 33 times less. Conclusion: statistically significant predominance of AB to RBD above AB to NC and their main contribution to the level of humoral immunity to SARS-CоV-2 (p<0.001).
Introduction: The main tool for a systematic assessment of nutrition includes monitoring activities allowing for overall improvement of school meals in addition to identification and elimination of violations of the Russian sanitary and epidemiological legislation and a follow-up of children’s collectives. Objective: To evaluate the experience of cooperation with schoolchildren’s parents in issues of school feeding in the Tula Region. Methods: The sanitary and descriptive method was used in the assessment of results of inspections, organizational and methodological work on control over school nutrition, interaction with parents, and outcomes of parental control. Results: The article reviews the experience of cooperation of the public health inspectorate with the parent community to improve school feeding in the Tula Region. Considering a paramount importance of the quality of hot school meals and the expected effectiveness of its parental control, experts of the Regional Office of the Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor) have taken a number of effective outreach measures on healthy nutrition, development of essential practical and theoretical skills and abilities of a healthy lifestyle, proper algorithms in reacting to arising problems in school catering, and coordination of interactions between parent communities. Conclusion: The implementation of measures that ensure effective cooperation between the supervisory body and the parent community has made a significant contribution to improving the quality of hot school meals in the region.
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