MILWAUKEE (WKOW) -- The flu season is ramping up in Wisconsin.
The Centers for Disease Control and Prevention has moved the state from the low activity level to the high category.
Children's Wisconsin in Milwaukee can attest to the increase.
In December, it had 829 flu cases, including 46 patients that had to be hospitalized.
In December of 2018, there were just 9 flu cases and four hospitalizations.
Some health experts fear numbers will increase, now that students are back in school after the holidays.
The state health department recommends everyone keep their hands clean, cover their cough and stay home if you're sick.
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