A Texan farm worker has contracted bird flu from an infected cow, marking the first time the HSN1 virus has been recorded spreading from mammals to humans, according to the Centers for Disease Control and Prevention.

New images show the dairy farmer with bloodshot eyes after he was the first case to catch bird flu from a mammal – in this case an infected cow – as the WHO claimed this is a "milestone" of "enormous concern"

In a report published Friday, the CDC said that they found "strong evidence" through genetic data that the farmer caught bird flu from a cow in March.