A California duck farm has tested positive for H5N9, marking the first confirmed case in the U.S. The outbreak began on November 23, 2024, after a rise in duck deaths.
H5N9 is a low-pathogenic virus that usually causes mild symptoms in birds. Officials have not reported any human infections linked to the outbreak. The virus has been detected in farmers in other countries, but no cases have been confirmed in the U.S.