CDC: 2016-2017 Influenza Vaccine Efficacy Report

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The 2016-2017 vaccine was 48% effective overall, and 43% effective against the predominant circulating influenza H3N2 strain.
The 2016-2017 vaccine was 48% effective overall, and 43% effective against the predominant circulating influenza H3N2 strain.

HealthDay News — This year's influenza vaccine is a fairly good match for the circulating viruses, according to research published in the the US Centers for Disease Control and Prevention's Morbidity and Mortality Weekly Report.

These findings were based on data from 3,144 children and adults with acute respiratory illness seen from November 28, 2016, to February 4, 2017, at 5 sites with outpatient clinics in the United States.

Overall, the vaccine is 48% effective. For the predominant circulating influenza A type H3N2 flu strain, its effectiveness comes in at 43%. It is 73% effective against influenza B viruses, according to the CDC.

"The effectiveness is a little bit lower than we would like to see, but it's similar to what we have seen for H3 viruses when the vaccine is a good match for what's circulating," Brendan Flannery, Ph.D., an epidemiologist at the CDC, told HealthDay.

Reference

Flannery B, Chung JR, Thacker SN, et al. Interim estimates of 2016-2017 seasonal influenza vaccine effectiveness — United States, February 2017. MMWR Morb Mortal Wkly Rep. 2017;66:167-171. doi: 10.15585/mmwr.mm6606a3

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