2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases

The aim was to analyze heard immunity against influenza viruses as well as severe course of influenza infection prior to the 2019–2020 epidemic season. Methods. Blood sera samples were collected prior to and after conducting population-wide influenza vaccination campaign at the sanitary and epidemio...

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Autores principales:	T. N. Ilyicheva, N. P. Kolosova, A. G. Durymanov, P. Yu. Torzhkova, S. V. Svyatchenko, Y. A. Bulanovich, E. V. Ivanova, K. I. Ivanova, A. B. Ryzhikov
Formato:	article
Lenguaje:	RU
Publicado:	Sankt-Peterburg : NIIÈM imeni Pastera 2021
Materias:	influenza virus herd immunity hemagglutination inhibition test antibody protective titers severe influenza influenza death rate risk groups Infectious and parasitic diseases RC109-216
Acceso en línea:	https://doaj.org/article/15208a17d35c4df4a36e23d2d70c7950
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spelling	oai:doaj.org-article:15208a17d35c4df4a36e23d2d70c79502021-11-22T07:09:55Z2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases2220-76192313-739810.15789/2220-7619-HIT-1456https://doaj.org/article/15208a17d35c4df4a36e23d2d70c79502021-11-01T00:00:00Zhttps://www.iimmun.ru/iimm/article/view/1456https://doaj.org/toc/2220-7619https://doaj.org/toc/2313-7398The aim was to analyze heard immunity against influenza viruses as well as severe course of influenza infection prior to the 2019–2020 epidemic season. Methods. Blood sera samples were collected prior to and after conducting population-wide influenza vaccination campaign at the sanitary and epidemiological centers in different regions of the Russian Federation as well as at the Siberian Federal District, respectively. Sera samples were tested by using hemagglutination inhibition (HI) assay with vaccine strains A/Brisbane/02/2018 (H1N1)pdm09, A/Kansas/14/2017 (H3N2), B/Colorado/06/2017 (Victoria lineage). Baseline clinical and autopsy materials in case of influenza infection in vaccinated patients or severe and fatal influenza cases were collected to be tested by RT-PCR at the sanitary and epidemiological centers, Rospotrebnadzor. All influenza-virus positive samples were further sent to the SRC VB “Vector”. Results. A total of 7,896 and 600 blood serum samples were collected from subjects at Siberian Federal District prior to and after the populationwide influenza vaccination campaign, respectively. Prior to the epidemic season, the proportion of individuals seropositive for the influenza A virus subtypes A/(H1N1)pdm09 and A/H3N2 exceeded 50% in most of the regions, whereas frequency of those seropositive for the influenza B virus was profoundly lower ranging from 12 to 46% in the Northwestern Federal District and Volga Federal District, respectively. After influenza vaccination, the percentage of seropositive subjects in the Siberian Federal District increased as follows: for influenza subtype A/(H1N1)pdm09 — from 66 up to 79%, influenza subtype A/H3N2 — from 68 up to 78%, and for influenza B/Victoria — from 32 up to 47%. In 2019–2020, influenza B virus more frequently caused severe infection that agrees with the herd immunity data prior to the epidemic season. However, the vast majority of the influenza cases with fatal outcome was associated with influenza virus A A/H1N1pdm09 subtype. Conclusion. Quality of influenza vaccine, especially that one intended to vaccinate risk group subjects remains a crucial issue for contemporary scientific community. The study was conducted within the framework of the State Assignments no. 1/16 and 2/18.T. N. IlyichevaN. P. KolosovaA. G. DurymanovP. Yu. TorzhkovaS. V. SvyatchenkoY. A. BulanovichE. V. IvanovaK. I. IvanovaA. B. RyzhikovSankt-Peterburg : NIIÈM imeni Pasteraarticleinfluenza virusherd immunityhemagglutination inhibition testantibody protective titerssevere influenzainfluenza death raterisk groupsInfectious and parasitic diseasesRC109-216RUInfekciâ i Immunitet, Vol 11, Iss 5, Pp 927-933 (2021)
institution	DOAJ
collection	DOAJ
language	RU
topic	influenza virus herd immunity hemagglutination inhibition test antibody protective titers severe influenza influenza death rate risk groups Infectious and parasitic diseases RC109-216
spellingShingle	influenza virus herd immunity hemagglutination inhibition test antibody protective titers severe influenza influenza death rate risk groups Infectious and parasitic diseases RC109-216 T. N. Ilyicheva N. P. Kolosova A. G. Durymanov P. Yu. Torzhkova S. V. Svyatchenko Y. A. Bulanovich E. V. Ivanova K. I. Ivanova A. B. Ryzhikov 2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
description	The aim was to analyze heard immunity against influenza viruses as well as severe course of influenza infection prior to the 2019–2020 epidemic season. Methods. Blood sera samples were collected prior to and after conducting population-wide influenza vaccination campaign at the sanitary and epidemiological centers in different regions of the Russian Federation as well as at the Siberian Federal District, respectively. Sera samples were tested by using hemagglutination inhibition (HI) assay with vaccine strains A/Brisbane/02/2018 (H1N1)pdm09, A/Kansas/14/2017 (H3N2), B/Colorado/06/2017 (Victoria lineage). Baseline clinical and autopsy materials in case of influenza infection in vaccinated patients or severe and fatal influenza cases were collected to be tested by RT-PCR at the sanitary and epidemiological centers, Rospotrebnadzor. All influenza-virus positive samples were further sent to the SRC VB “Vector”. Results. A total of 7,896 and 600 blood serum samples were collected from subjects at Siberian Federal District prior to and after the populationwide influenza vaccination campaign, respectively. Prior to the epidemic season, the proportion of individuals seropositive for the influenza A virus subtypes A/(H1N1)pdm09 and A/H3N2 exceeded 50% in most of the regions, whereas frequency of those seropositive for the influenza B virus was profoundly lower ranging from 12 to 46% in the Northwestern Federal District and Volga Federal District, respectively. After influenza vaccination, the percentage of seropositive subjects in the Siberian Federal District increased as follows: for influenza subtype A/(H1N1)pdm09 — from 66 up to 79%, influenza subtype A/H3N2 — from 68 up to 78%, and for influenza B/Victoria — from 32 up to 47%. In 2019–2020, influenza B virus more frequently caused severe infection that agrees with the herd immunity data prior to the epidemic season. However, the vast majority of the influenza cases with fatal outcome was associated with influenza virus A A/H1N1pdm09 subtype. Conclusion. Quality of influenza vaccine, especially that one intended to vaccinate risk group subjects remains a crucial issue for contemporary scientific community. The study was conducted within the framework of the State Assignments no. 1/16 and 2/18.
format	article
author	T. N. Ilyicheva N. P. Kolosova A. G. Durymanov P. Yu. Torzhkova S. V. Svyatchenko Y. A. Bulanovich E. V. Ivanova K. I. Ivanova A. B. Ryzhikov
author_facet	T. N. Ilyicheva N. P. Kolosova A. G. Durymanov P. Yu. Torzhkova S. V. Svyatchenko Y. A. Bulanovich E. V. Ivanova K. I. Ivanova A. B. Ryzhikov
author_sort	T. N. Ilyicheva
title	2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
title_short	2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
title_full	2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
title_fullStr	2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
title_full_unstemmed	2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
title_sort	2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases
publisher	Sankt-Peterburg : NIIÈM imeni Pastera
publishDate	2021
url	https://doaj.org/article/15208a17d35c4df4a36e23d2d70c7950
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2019–2020 herd immunity to seasonal influenza viruses prior to epidemic season and rate of severe disease cases

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