This isn't spillover. The virus mutated so it can transmit between cows, and now dairy workers are able to catch that. With the risk being that it mutates again

This isn't spillover. The virus mutated so it can transmit between cows, and now dairy workers are able to catch that. With the risk being that it mutates again into a human to human form. Spillover is you have sporadic cases caught *from birds* but transmission remains between birds.