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Abstract

Human seasonal influenza occurs in the northern and southern hemispheres in epidemics in the colder months of the year. These vary annually in their mix of viruses (which constantly evolve), the severity of the illness and the ‘fit’ with the vaccine composition, which is reviewed annually by the World Health Organization (WHO) for each hemisphere.

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/content/10.2807/esw.12.34.03256-en
2007-08-23
2017-11-24
http://instance.metastore.ingenta.com/content/10.2807/esw.12.34.03256-en
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