Headline : Halting the Bird Flu Outbreak in Cows May Require Thinking Beyond Milk

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As the bird flu outbreak in dairy cows has ballooned, officials have provided repeated reassurances: The virus typically causes mild illness in cows, they have said, and because it spreads primarily through milk, it can be curbed by taking extra precautions when moving cows and equipment.

A new study, published in Nature on Tuesday, presents a more complex picture.

Some farms have reported a significant spike in cow deaths, according to the paper, which investigated outbreaks on nine farms in four states. The virus, known as H5N1, was also present in more than 20 percent of nasal swabs collected from cows. And it spread widely to other species, infecting cats, raccoons and wild birds, which may have transported the virus to new locations.

“There’s probably multiple pathways of spread and dissemination of this virus,” said Diego Diel, a virologist at Cornell University and an author of the study. “I think it will be really difficult to control it at this point.”

Read more from the original article on here at www.nytimes.com.

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