Cows in California have tested positive for highly pathogenic avian influenza (HPAI) and are now in quarantine, according to the state's Department of Food and Agriculture (CDFA). California hosts a fifth of the nation's dairy cows, and it is the number one producer of milk, butter, and ice cream, and the number two producer of cheese and yogurt in the US. The current infections of HPAI among cattle in the US started in March, when a 'mysterious' illness broke out among dairy cows in Texas...These cows were the first in the world to officially test positive for the bird flu...