[Current strategies for vaccine prevention of influenza].

Six-year immunologic surveillance of schoolchildren vaccinated according to different schedules in the town of Novgorod demonstrated the efficacy of overall vaccinations of children and young people with live anti-influenza vaccines in autumn and winter for 2 years. Then an interval of 3 years is to be made, followed by another 2-year revaccination cycle, provided the same serologic subtypes of influenza A and B are still circulating.