Why we still don’t know exactly how bird flu is spreading between cows

Why we still don’t know exactly how bird flu is spreading between cows

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Health

Early evidence suggests that a bird flu virus called H5N1 may be infecting dairy cows through contaminated milking equipment – but poor surveillance has made it nearly impossible to rule out other possibilities

By Grace Wade


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Bird flu has been spreading among dairy cows in the US

Getty Images/Cavan Images

Public health experts still don’t know how a bird flu virus has been spreading for months among dairy cows in the US – though early evidence points to contaminated milking equipment.

Since late March, 51 dairy herds across nine US states have tested positive for H5N1, a bird flu virus that has killed millions of birds and thousands of mammals worldwide. Genetic analysis of samples from infected cattle suggests the outbreak began when cows on a Texas farm contracted…

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