The WHO advisory group that recommends which influenza viruses should be included in seasonal vaccines said it would wait another month, until March 21, to select an H3N2 component for the Northern Hemisphere’s 2019-2020 vaccines “in light of recent changes in the proportions of” circulating viruses.
Delaying the recommendation for H3N2 — an influenza A subtype that is notoriously difficult to protect against and generally portends more serious seasons when it predominates, like the one that occurred last year in the United States — “will allow more time for monitoring virus circulation and characterization of appropriate vaccine viruses,” WHO said.
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