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Abstract

While two influenza B virus lineages have co-circulated, B/Yamagata-lineage circulation has not been confirmed since March 2020. The WHO FluNet database indicates that B/Yamagata-lineage detections were reported in 2021 and 2022. However, detections can result from use of quadrivalent live-attenuated vaccines. Of the type B viruses detected post-March 2020, all ascribed to a lineage have been B/Victoria-lineage. There is need for a global effort to detect and lineage-ascribe type B influenza viruses, to assess if B/Yamagata-lineage viruses have become extinct.

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/content/10.2807/1560-7917.ES.2022.27.39.2200753
2022-09-29
2022-11-30
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2022.27.39.2200753
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