Senior onderzoeker Infectieziekten in de Eerste Lijn, epidemioloog
Has influenza B/Yamagata become extinct and what implications might this have for quadrivalent influenza vaccines?
Paget, J., Caini, S., Del Riccio, M., Waarden, W. van, Meijer, A. Has influenza B/Yamagata become extinct and what implications might this have for quadrivalent influenza vaccines? Eurosurveillance: 2022, 27(39)Lees online
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.