Some Texas schools have had so many flu absences this week -- that they've had to close.
Experts say flu season in Texas generally runs from October to March, with February usually being the height of the season.
Emily Palmer with the Department of State Health Services says the flu has been considered widespread in Texas since the week ending January 27th.
Palmer says it's not too late to get a flu shot -- and it takes about two weeks for the shot to fully take effect.
Good Shepherd Episcopal School in Dallas is closed today after more than 100 of its students called in sick each day this week.
In East Texas, the Eustace school district told students to stay home Tuesday and Wednesday after about 220 students were out sick.