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Influenza activity increases in the fall and peaks between December and February. According to GoodRx Health, people should get a flu shot by the end of October every year.
It is 40 - 60 percent effective, and the FDA has approved nine flu vaccines for this season. They all protect against four virus strains.
Pharmacies and healthcare providers may only carry a few brands of the vaccine. Click here to view the detailed flu vaccine chart.
