Over the course of one week, states reporting high flu activity went from nine to 19, along with New York City.
The latest data was for the week ending on Dec. 29th.
The Center for Disease Control in the U.S. says the
hospitalisation rates also went up, particularly for children aged 0 to 4, though they still remain comparatively low after last year’s severe flu season.
The death rates are also low.
The CDC is expecting an increase in hospitalisations, and probably an increase in mortality.