Because flu viruses mutate frequently, vaccines are reformulated each year to target the virus strains predicted to prevail during the coming year. — AFP
The flu sickens and kills many in a good year, and this is already a bad one.
According to the US Centers for Disease Control and Prevention (CDC), since 2010, flu has annually caused “between 9.2 million and 35.6 million illnesses, between 140,000 and 710,000 hospitalisations and between 12,000 and 56,000 deaths” in the United States.
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