For citations:
Kolosova N.P., Ilyicheva T.N., Svyatchenko S.V., Danilenko A.V., Onkhonova G.S., Ivanova K.I., Susloparov I.M., Ryzhikov A.B. Initial and severe cases of influenza in 2020-2022 and population immunity prior to epidemic season. Medical Immunology (Russia). 2022;24(6):1219-1226. (In Russ.) https://doi.org/10.15789/1563-0625-IAS-2513