Oregon Confirms First Bird Flu Case in Dairy Cattle in Morrow County, Becoming the 22nd Affected State
The Oregon Department of Agriculture and the USDA's Animal and Plant Health Inspection Service have confirmed a detection of highly pathogenic avian influenza at a commercial dairy in Morrow County, the first infection in an Oregon dairy herd, making Oregon the 22nd U.S. state with bird flu in dairy cattle.
The infection was found through Oregon's routine surveillance; the herd had tested negative in multiple earlier rounds. Milk samples were confirmed by PCR testing at the federal National Veterinary Services Laboratories as H5 clade 2.3.4.4b. The dairy has been placed under state quarantine restricting cattle movement to prevent further spread. Officials stressed that commercial pasteurized milk remains safe and consumers need not worry.
Oregon is the third previously unaffected state to confirm dairy cattle infections since early October. Washington confirmed its first case on October 8 and its infected herds have since grown to more than 40; Indiana confirmed its first case on November 2. Since the multistate outbreak began in March 2024, bird flu has continued to spread through U.S. dairy herds, and agriculture officials are urging producers to strengthen biosecurity and report abnormalities promptly.
Source: Oregon Department of Agriculture
Published by GSM · USA (original Chinese edition)
Photo: 牧场上的奶牛。图：Angela Marie／Wikimedia Commons，CC BY 2.0授权 / A dairy cow on pasture. Photo: Angela Marie / Wikimedia Commons, CC BY 2.0
