| http://www.w3.org/ns/prov#value | - s has been known to vary based on a number of factors including virus type, age, the particular flu season and variations in an individual's immunity.Although it is far from perfect, flu vaccination is by far the best tool we have to protect from flu, Frieden said.BETTER VACCINESFrieden said the U.S. Department of Health and Human Services as well as pharmaceutical companies are working to produc
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