CDC map shows bird flu activity in U.S. wastewater with California leading cases

A new map from the CDC shows where bird flu has been detected in U.S. wastewater, with California reporting 49 of 52 positive cases. Governor Gavin Newsom declared a state of emergency on December 18 due to the outbreak. The CDC also reported a severe human case in Louisiana, raising concerns about the virus mutating to adapt to humans. Wastewater monitoring is being used to track the virus's spread, affecting agriculture significantly. Bird flu detections have been confirmed in California, Nevada, Iowa, and Illinois. The CDC's surveillance system covers 45% of the U.S. population, but it cannot specify the virus's source or subtype.