Livestock retroviruses have been found in humans. Google H-CAEV. CAE is an incurable retrovirus in goats, closely related to one in sheep, OPP. Both cause arthritis, lung damage and sometimes brain damage. Both are transmitted primarily thru milk to offspring. People drink goat’s milk and voila!
The finding of these retroviruses in humans - - mostly in Mexico - - were linked in some cases to disease in humans.
Doubtful that there could be lab contamination with goats!
Thanks for posting the CAEV info.
But I don’t yet see support for incorporation of the CAEV virus into the human genome, as has been claimed for XMRV in the paper published in Science.
Something to watch out for, to be sure.