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How is the composition of the vaccine determined?

April 26, 2017composition vaccine

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How is the composition of the vaccine determined?

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Every year the World Health Organization (WHO) recommends the composition of the vaccine, based on information they get from 112 National Influenza Centers representing 83 countries all over the world. These centers inform the WHO which (new) types of influenza have been spotted in their countries. Based on the information collected through this surveillance system, the WHO recommends which strains should be included in the vaccine for the next season.