U.S. Needs to Better Track Bird Flu Spread in Farm Animals, Farm Workers, Epidemiologist Says
Four years after a mysterious respiratory virus jumped from animals into humans and launched the COVID pandemic, wary epidemiologists are keeping a close eye on a strain of avian influenza that is spreading among U.S. dairy cows
![U.S. Needs to Better Track Bird Flu Spread in Farm Animals, Farm Workers, Epidemiologist Says](https://static.scientificamerican.com/dam/m/54050c7d139e700d/original/GettyImages-1305230338_WEB.jpg?w=1200)
Four years after a mysterious respiratory virus jumped from animals into humans and launched the COVID pandemic, wary epidemiologists are keeping a close eye on a strain of avian influenza that is spreading among U.S. dairy cows
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