Slow Response to Bird Flu in Cows Worries Scientists
The H5N1 virus is a long way from becoming adapted to humans, but limited testing and tracking mean we could miss danger signs
![Slow Response to Bird Flu in Cows Worries Scientists](https://static.scientificamerican.com/dam/m/34f4bfedfc218d5f/original/GettyImages-1363794589_WEB.jpg?w=1200)
The H5N1 virus is a long way from becoming adapted to humans, but limited testing and tracking mean we could miss danger signs
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