
The flu has been on the rise across the United States for four weeks in a row, according to the Walgreens Flu Index.
Flu activity soared 52% for the week ending Jan. 18 over the previous week and continued rising for the next four weeks.

The flu has been on the rise across the United States for four weeks in a row, according to the Walgreens Flu Index.
Flu activity soared 52% for the week ending Jan. 18 over the previous week and continued rising for the next four weeks.