I would just avoid contact between poultry and wild birds in general. Contact between populations breeds disease, plain and simple. No matter how mild the disease it would be harmful to your birds. It might not be bird flu but any disease is devastating. Now most humans, on the other hand do not have any diseases to fear from handling healthy wild birds. (Just use common sense and wash hands afterwards.)
Birds are pretty fragile (their respiratory system has a lot of moving parts) so the diseases they carry wouldn’t be very harmful to us.
Birds are pretty fragile (their respiratory system has a lot of moving parts) so the diseases they carry wouldn’t be very harmful to us.