There has also been a push among companies to develop a bird flu vaccine for poultry, a market potentially far larger than that for humans. Many countries' pandemic plans say flu shots should go first to the most vulnerable while supply is limited. The agreements include six of the largest seasonal flu manufacturers, such as GSK, Sanofi and CSL Seqirus, the WHO said. NEW APPROACHESIn a pandemic, vaccine manufacturers would shift production of seasonal flu vaccines and instead make shots tailored to the new outbreak when needed. The results will be closely watched, as the data on Moderna’s seasonal flu candidate was mixed.

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