The current seasonal flu vaccine protects about 45% of recipients against the circulating strains, according to midseason estimates of vaccine effectiveness (VE) published today in the Centers for Disease Control and Prevention’s (CDC’s) Morbidity and Mortality Weekly Report.

A higher percentage, 58%, was seen in the first estimates on effectiveness during Canada’s flu season, which were published in a separate study today.

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US protection 50% against flu B

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