Flu cases and deaths are rising rapidly in Wisconsin and the U.S., driven by the dominant Influenza A strain, prompting health warnings.

Flu activity is rising sharply in Wisconsin and nationwide, with 4.6 million cases and 1,900 deaths reported since the season began, according to the CDC. In Wisconsin, flu positivity rates nearly tripled in one week, and two pediatric deaths have been confirmed. Influenza A, a highly contagious strain, is dominant. Health experts, including Dr. Chris Crnich of UW Health, warn of increased risk due to low vaccination rates, unpredictable weather, and indoor crowding, urging vaccination, early antiviral treatment, and preventive measures to reduce spread and protect healthcare systems.