I have a6 year old rooster that started limping a few weeks ago, thought nothing of it at the time since he had no noted injuries. Few days ago he is having very hard time walking as if his joints are painful, his wattles are swollen and he has dark spots on his comp/mild swelling as well. His feathers are ruffled. I deworm them every six months. I realized we had one pass away in the summer after same type of issues. Is this a bacterial infection?? What antibiotic could I give my birds to treat? ?Please help