Vials of an H1 flu vaccine produced by a Chinese drug maker. The WHO recommends the composition of seasonal influenza vaccines for the coming season each year, based on exhaustive studies. Photo: AP

Calling the shots: how the WHO formulates vaccines for flu season

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Vials of an H1 flu vaccine produced by a Chinese drug maker. The WHO recommends the composition of seasonal influenza vaccines for the coming season each year, based on exhaustive studies. Photo: AP
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