The CDC says that the flu numbers in the U.S. have plummeted 98% this year. The reasons for the dramatic decline include fewer people traveling, more people wearing masks, and social distancing, along with more Americans getting the flu shot, according to reports. More adults got the flu shot in 2020 compared to the previous year, says Healthline. But although flu activity is currently low, experts warn we could still see an uptick in cases in 2021.