justyourluck, 
🐄 In lung tissue... of an asymptomatic cow...
"US federal authorities said on Wednesday that the virus had been found in lung tissue collected from a seemingly healthy cow."
🐄 Only cows with symptoms are being tested?
"Another possibility, he says, is that “asymptomatic cows that we are not testing are shedding virus into milk”."
1/
#H5N1 #BirdFlu #AvianFlu
https://www.scientificamerican.com/article/as-bird-flu-spreads-through-cows-is-pasteurized-milk-safe-to-drink/
