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There is no "usual flu vaccine", they make a new one twice a year, meant to address whatever strain is in circulation.
by liability 6y ago
There is no "usual flu vaccine", they make a new one twice a year, meant to address whatever strain is in circulation.
- wittyreference 6y agoI think they meant when they go for their regularly scheduled -"usual" flu vaccine, and their question was meant to address what strains would be targeted in a given year.