Dairy farmers and veterinarians in northern Texas noticed illness among cattle.
Genomic sequences from H5N1 viruses suggest the current bird flu epidemic started with a spillover from birds into cows in Texas, and then spread to other states within cattle. Routes and timing remain uncertain because of limited data.
Why did it take so long to recognize the virus on high-tech farms in the world's richest country? Because even though H5N1 has circulated for nearly three decades, its arrival in dairy cattle was most unexpected. "People tend to think that an outbreak starts at Monday at 9 a.m. with a sign saying, 'Outbreak has started,'" said Jeremy Farrar, chief scientist at the World Health Organization. "It's rarely like that.
In hindsight, Turley wished he had made more of the migrating geese that congregate in the panhandle each winter and spring. Geese and other waterfowl have carried H5N1 around the globe. They withstand enormous loads of the virus without getting sick, passing it on to local species, like blackbirds, cowbirds, and grackles, that mix with migrating flocks.
Bethany Boggess Alcauter, director of research at the National Center for Farmworker Health, has worked in the panhandle and suspected farmworkers were unlikely to see a doctor even if they needed one. Clinics are far from where they live, she said, and many don't speak English or Spanish -- for instance, they may speak Indigenous languages such as Mixtec, which is common in parts of Mexico.
The observation hints that herds gain immunity, if temporarily. Indeed, early evidence shows that H5N1 triggers a protective antibody response in cattle, said Marie Culhane, a professor of veterinary population medicine at the University of Minnesota. Nonetheless, she and others remain uneasy because no one knows how the virus spreads, or what risk it poses to people working with cattle.
Federal authorities have pressed states to extract more intel from farms and farmworkers. Several veterinarians warn such pressure could fracture their relationships with farmers, stifling lines of communication.
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