The flu vaccine won't be as effective against some of the viruses making the rounds this season.
The CDC says that's because the virus has mutated or "drifted."
Infectious disease specialist Dr. Alexandra Yamshchikov of Rochester Regional Health System says you should still get a flu shot if you haven't already.
"Half of the viruses circulating are still the same strain that the vaccine is extremely effective against,” she said. “Even when faced with infection with one of the drifted viruses, the vaccine does still offer some protection in terms of lessening the symptoms and improving outcomes for patients."
The most common strain of the flu reported so far this season is the H3N2 virus, which the CDC says has been linked to higher rates of hospitalization and death, especially for those over the age of 65.
