For the body to make the right antibodies to protect people during the influenza season, the vaccines should contain H and N proteins that match well to the circulating virus.It takes several months to produce vaccines in the amounts needed for global distribution. That means the circulating strains are anticipated based on the previous season's trends. For countries in the, the WHO began consultations in February to recommend viruses for inclusion in flu vaccines for the 2023-24 flu season.
Tracking the effectiveness of vaccines during flu seasons can tell if recommendations for a given region were correct.
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