Influenza

CDC: Flu shot effective more than half of the time

Published in Physician Law Weekly, September 1st, 2004

Last season's influenza vaccine was effective more than half the time, despite fears the shot was not an exact match for the flu strain that dominated the United States, the government says.

A study of more than 1300 people in Colorado, including more than 300 who were lab-confirmed to have the flu, found that the vaccine worked about 52% of the time for healthy adults and 38% of the time for those with previous medical conditions, the U.S. Centers for Disease Control and Prevention (CDC) reported.

The flu shot "still provided substantial health benefit," even though its protection was much lower than the up to 90% protection that the vaccine affords...

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Source: Physician Law Weekly (2004-09-01)

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