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(NEWSER) – You should still get a flu shot, CDC officials recommend—it just might not be as effective as they'd hoped, NBC News reports. Most cases of the virus this year are the result of a mutated variation of the H3N2 strain—so far this season's most commonly reported—and the vaccine isn't proving effective against it, the agency said in a health advisory sent to doctors last night.

The warning said that 52% of the 85 flu samples collected between Oct. 1 and Nov. 22 were different than the viruses in the vaccine mix this year, CNN reports. The H3N2 virus is linked to more instances of hospitalization and death, especially for children, the elderly, and people with chronic health issues. "The flu is bad, and you want to do anything you can to prevent getting it and to prevent giving it to other people," a Manhattan pediatrician tells CNN.

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