TIME

People who got a flu shot this winter are only 23% less likely to get the flu than someone who didn’t get the vaccine, the Centers for Disease Control and Prevention (CDC) said in a new report Thursday.

This flu season, H3N2 flu viruses have been the most predominant, but the CDC reports that about 70% of them have genetically changed so that they are not as responsive to the flu vaccine as they were in the past. This is likely why the vaccine appears to be less effective, a measure the CDC calculates by looking at the number of medical visits related to the flu.

Since the flu vaccine is developed based on early predictions of what flu viruses will be most common during a certain season, it’s always possible that the estimates will be off and the vaccine won’t protect against the most common flu viruses circulating. Since…

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