H5N1 Bird Flu Spreads to 700 US Dairy Herds: What You Need to Know Now

About this episode

The episode discusses the alarming spread of H5N1 bird flu among U.S. dairy herds and its implications for public health.

Bird Flu SOS: Urgent H5N1 News & Safety [Host, urgent but steady tone]: Welcome to Bird Flu SOS: Urgent H5N1 News & Safety. I'm your host, and today we have a critical update: H5N1 bird flu has exploded in California dairy herds, with the California Department of Food and Agriculture confirming 35 new infected farms in the last 30 days alone, on top of over 700 affected herds since March. This multi-species outbreak, now hitting cows, poultry, seals, and humans, is completely out of control in wild birds, per scientists at Doral Health & Wellness and the University of Nebraska Medical Center. The virus, clade 2.3.4.4b, has spread to every continent except Australia since 2020, Wikipedia reports, jumping from migratory birds to mammals like dairy cows in 13 U.S. states, with high viral loads in milk causing cat deaths from unpasteurized sources. In Weld County, Colorado, it fueled 10 human farmworker cases via cow-to-human transmission. CDC data shows 57 U.S. human cases with mild symptoms like conjunctivitis, but a Louisiana patient died in December 2025, the first U.S. H5N1 fatality, prompting California Governor Gavin Newsom's state of emergency. Experts are sounding the alarm…

People in this episode

Host: Host

Topics covered

• H5N1 bird flu
• dairy herds
• public health
• animal transmission
• pandemic risk
• wildlife impact

Keywords

• H5N1
• bird flu
• dairy cows
• California
• human cases
• pandemic
• transmission
• wild birds
• public health

Mentioned in this episode

Organizations: California Department of Food and Agriculture, Doral Health & Wellness, University of Nebraska Medical Center

Places: California, Louisiana, Colorado, Antarctica

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