Do you have a vet to take him too? I would separate him immediately from the rest of the flock, and quarantine him. I would definitely treat with antibiotics, but have you given him any medicine yet? It could be an allergic reaction.
As to your rabies question :
Only mammals can be infected with rabies and potentially transmit the disease. Species that pose no risk of a rabies direct transmission include avians (e.g.,chickens, ducks, geese, hawks, eagles, owls, and even vultures), reptiles (lizards, turtles, etc.), and amphibians (e.g., frogs).
I would try to get the swelling down. Can you ice the injuries?