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The 2017-2018 flu season was made worse by two factors: strains that hit the very young and elderly especially hard, and a poor matchup between those strains and those in the flu vaccine.
from WebMD Health https://ift.tt/2zzxluO
The 2017-2018 flu season was made worse by two factors: strains that hit the very young and elderly especially hard, and a poor matchup between those strains and those in the flu vaccine.
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