Differentiation of influenza B lineages circulating in different regions of Brazil, 2014-2016, using molecular assay.

Autor:	da Silva DBB; Respiratory Virus Laboratory/NDR/VC, Institute Adolfo Lutz, Brazil/Nacional Influenza Centre/World Health Organization., de Oliveira Santos KC; Respiratory Virus Laboratory/NDR/VC, Institute Adolfo Lutz, Brazil/Nacional Influenza Centre/World Health Organization., Benega MA; Respiratory Virus Laboratory/NDR/VC, Institute Adolfo Lutz, Brazil/Nacional Influenza Centre/World Health Organization., de Paiva TM; Respiratory Virus Laboratory/NDR/VC, Institute Adolfo Lutz, Brazil/Nacional Influenza Centre/World Health Organization.
Jazyk:	angličtina
Zdroj:	Vaccine: X [Vaccine X] 2022 Sep 30; Vol. 12, pp. 100220. Date of Electronic Publication: 2022 Sep 30 (Print Publication: 2022).
DOI:	10.1016/j.jvacx.2022.100220
Abstrakt:	Background: Two antigenically and genetically distinct lineages of influenza B viruses (B/Victoria and B/Yamagata) have been co-circulating worldwide since 2002. Virological surveillance is essential to differentiate between both lineages with a view to the annual updating of the B component for the trivalent or quadrivalent influenza vaccine composition. Methods: The samples analyzed in the present study were collected by influenza sentinel units located in the Southeast, Midwest, North, and Northeast regions of Brazil, part of the National Influenza Virus Surveillance Network, coordinated by the Ministry of Health of Brazil. A total of 870 influenza B positive samples by reverse transcription real - time polymerase chain reaction (RT-qPCR), collected during 2014, 2015, and 2016 influenza seasons, were submitted to the influenza B lineage genotyping panel for characterization as B/Yamagata or Victoria lineages using RT-qPCR. Results: Of the 197 samples analyzed in 2014, a total of 160 (81 %) corresponded to the B/Yamagata lineage, 19 (10 %) to the B/Victoria lineage, and 18 (9 %) to indeterminate lineages. Of the 190 samples analyzed in 2015, a total of 124 (65 %) corresponded to the B/Yamagata lineage; 55 (29 %) to the B/Victoria lineage, whereas 11 (6 %) were of indeterminate lineages. Of the 483 samples analyzed in 2016, a total of 297 (62 %) corresponded to the B /Victoria lineage; 174 (36 %) to the B/Yamagata lineage and 12 (2 %) to indeterminate lineages. This cross-sectional study revealed influenza B virus (IBV) infection in all age groups, and among them, the highest prevalence was observed in individuals between 11 and 49 years of age Our findings demonstrate the match between influenza B virus lineages recommended by the World Health Organization (WHO) for the trivalent vaccine composition to be used in the Southern Hemisphere (SH) and the predominant circulating viruses during the 2014, 2015, and 2016 seasons. Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (© 2022 The Author(s).)
Databáze:	MEDLINE
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