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New data from the Centers for Disease Control and Prevention shows a sharp rise in flu cases across the United States, with Kansas among the hardest-hit states.

Between Dec. 20 and Dec. 27, flu cases nationwide increased by 33%, and more than 33,000 people were hospitalized with flu-related complications. Just two weeks earlier, only six states reported very high flu activity. By the end of December, that number jumped to 30 states, showing how quickly the virus is spreading.

During the week ending Dec. 20, 3.2% of doctor visits were for flu symptoms. One week later, that number rose to 6.2%. Health officials have confirmed at least two flu-related deaths in the state this season.

The surge is being linked to a fast-spreading strain of influenza A known as subclade K, sometimes called the super flu. Flu season typically peaks in February, raising concerns that cases could continue to rise.

Health experts say it is not too late to get vaccinated, watch symptoms closely, and seek care early to reduce serious illness and hospitalizations.