The Centers for Disease Control and Prevention said Thursday that 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.
A CDC study of more than 1,300 people in Colorado, including more than 300 who were lab-confirmed to have the flu, found that the vaccine worked about 52 percent of the time for healthy adults and 38 percent of the time for those with previous medical conditions.
The CDC said the effectiveness rate of the flu shot was similar to other years in which the vaccine's strains did not match what was circulating in public.
In years in which the vaccine matches the dominant flu strain, the shot's effectiveness can reach up to 90 percent. More than 150 children nationwide died during the flu season.
For more information, you may visit: www.cdc.gov/mmwr