Flu activity could continue to increase in the U.S. over the next few weeks, according to a top flu epidemiologist at the CDC.

The Centers for Disease Control and Prevention said this year’s flu season is “moderately severe” with at least 11 million cases of the illness. Of those 11 million cases, there have been 120,000 hospitalizations and 5,000 deaths so far, Reuters reported.

Flu-like illness was responsible for 11.3% of outpatient visits, surpassing the national average and indicating an increasing viral spread throughout the state.

Seasonal influenza activity remained elevated and rose in the final week of December, U.S. Centers for Disease Control and Prevention data showed on Monday, as the agency for the first time classified the 2025-26 season as "moderately severe.

Boston's top health official blasted the federal health officials over rolled-back vaccine requirements while reporting that two children in the city died from the flu for the first time in over a decade.

A mutated strain of influenza A, H3N2 subclade K, is surging worldwide, sparking concern about a severe flu season in the United States.

Instead of requiring vaccinations for rotavirus, influenza, meningococcal disease, Covid-19, and hepatitis A and B, parents can choose whether to have the shots administered after consulting with healthcare providers.