I think they are suggesting this man developed bird flu with no evidence of interaction between animals. Suggesting a person with bird flu gave him this strain of bird flu.

The big concern with bird flu is that transmission between humans becomes viable. Then it can spread. When it’s confined to birds, only humans that work in chicken farms are going to catch it. When it can spread between humans then we are at risk of a pandemic.

This just raises the alarm that human transmission of bird flu could be happening. Because they haven’t ruled it out yet.