Flu shots reduced risk of illnesses by 36 percent this year: CDC report

People who got their flu shots this year had lower risks of contracting influenza — but vaccines have only been 36% effective, according to a Centers for Disease Control and Prevention report released Thursday.

The vaccines were most effective for children, and there was a 59% reduction in illnesses among them who were ages 6 to 8 years old, the CDC found.

Adults between the ages of 18 and 49 saw the reduced risk of the flu by 33%.

The vaccines were only 25% effective against a kind of flu called Type A H3N2. However, it was most effective fighting influenza B and the H1N1 flu strain, according to the report.

During the 2014-2015 flu seasons, the reduced risks of illnesses were less than 20%.

The center took data from 4,562 children and adults in the U.S. with minor reparatory illnesses during November to February.

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2018 flu season in the US
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2018 flu season in the US
Emergency room nurse Kathy Nguyen wears a mask as deals with flu patients at Palomar Medical Center in Escondido, California, U.S., January 18, 2018. REUTERS/Mike Blake
Emergency room nurse Christine Bauer treats Joshua Lagade of Vista, California, for the flu as his girlfriend Mayra Mora looks on in the emergency room at Palomar Medical Center in Escondido, California, U.S., January 18, 2018. REUTERS/Mike Blake
Emergency room nurse Christine Bauer treats Joshua Lagade of Vista, California, for the flu in the emergency room at Palomar Medical Center in Escondido, California, U.S., January 18, 2018. REUTERS/Mike Blake
Doug Hasselo, 87 of Carlsbad, California, is treated for the flu by float nurse Nellie Reyes in the emergency room at Palomar Medical Center in Escondido, California, U.S., January 18, 2018. REUTERS/Mike Blake
Joshua Lagade of Vista, California, gets an IV from emergency room nurse Christine Bauer at Palomar Medical Center in Escondido, California, U.S., January 18, 2018. REUTERS/Mike Blake
Emergency room nurse Richard Horner wears a mask as he deals with flu patients at Palomar Medical Center in Escondido, California, U.S., January 18, 2018. REUTERS/Mike Blake
A doctor hold a syringe as part of the start of the seasonal influenza vaccination campaign in Nice, France October 24, 2017. REUTERS/Eric Gaillard
Boxes of vaccines against the flu are seen as part of the start of the seasonal influenza vaccination campaign in Nice, France October 24, 2017. REUTERS/Eric Gaillard
PORTLAND, ME - DECEMBER 29: Troy Ali, 21 of Portland receives a flu shot from Greater Portland Health medical assistant Anissa Millette at the clinic in Franklin Towers on Cumberland Ave on Friday, December 29, 2017. (Staff Photo by Carl D. Walsh/Portland Press Herald via Getty Images)
SAN FRANCISCO, CA - JANUARY 22: Vials of the Fluvirin influenza vaccine are displayed at a Walgreens phramacy on January 22, 2018 in San Francisco, California. A strong strain of H3N2 influenza has claimed the lives of 74 Californians under the age of 65 since the flu season began in October of last year. People are being encouraged to get flu shots even through the vaccine has been only 30% effective in combating the influenza. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - JANUARY 22: A sign advertising flu shots is displayed at a Walgreens phramacy on January 22, 2018 in San Francisco, California. A strong strain of H3N2 influenza has claimed the lives of 74 Californians under the age of 65 since the flu season began in October of last year. People are being encouraged to get flu shots even through the vaccine has been only 30% effective in combating the influenza. (Photo by Justin Sullivan/Getty Images)
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