Numbers from the CDC this season show there's been at least 20 million cases nationwide. Doctors are urging people to get their flu shot, if they're haven't already.

The United States is seeing a second peak in flu cases this season. After doctor’s office visits for flu dipped early this year, they jumped past the previous season peak at the end of last month, with a 30% test positivity rate — and there are still months to go.

For a second time this season, at least 41 states are reporting high or very high levels of the flu. Here's how to stay safe.

Cases are peaking for a second time this flu season. At least 41 states are reporting high or very high levels of the flu. Dr. Rabia De Latour, a gastroenterologist at NYU Langone Health, discusses how to keep yourself and your family safe.