USDA said affected dairy cows do not appear to be transmitting the virus to other cattle within the same herd. …Additional testing was initiated on March 22 and over the weekend because farms have also reported finding deceased wild birds on their properties. Based on findings from Texas, the detections appear to have been introduced by wild birds.

So as far as we know, still not mammal to mammal

All of the animal industries the report examines are far less regulated than they should be and far less than the public believes they currently are. Today, wide regulatory gaps exist through which pathogens can spillover and spread, leaving the public constantly vulnerable to zoonotic disease.

https://animal.law.harvard.edu/news-article/animal-markets-and-zoonotic-disease/

Is just one study. Many say the animal industry is the breeding ground for the next pandemic. Not only in the US but everywhere. The question is not “if” but “when”