@WHO: Due to the evolving nature of #influenza viruses, flu vaccines need to be updated periodically. Twice a year, WHO brings together experts to analyze influenza virus surveillance data generated by the Global Influenza Surveillance and Response System https://t.co/KkvAcRV8Qd https://t.co/mYQXwLyeTM

@WHO: Due to the evolving nature of #influenza viruses, flu vaccines need to be updated periodically. Twice a year, WHO brings together experts to analyze influenza virus surveillance data generated by the Global Influenza Surveillance and Response System https://t.co/KkvAcRV8Qd https://t.co/mYQXwLyeTM

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