Due to the Evolving Nature of #influenza Viruses, the Flu Vaccine Composition Needs to Be ... - Latest Tweet by World Health Organization
The latest Tweet by World Health Organization states, 'Due to the evolving nature of #influenza viruses, the flu vaccine composition needs to be updated periodically. Twice a year, WHO brings together experts to analyse influenza virus surveillance data generated by the Global Influenza Surveillance and Response System'
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