I might provide an antibiotic to ward off secondary infections. I used Tylan, 1 cc per day for 1 week, injected into the breast muscle. Keep out of drafts. Provide supplemental heat, a 100 watt bulb should do, 24/7. I bought one that had a bad cold and frostbite from a freak cold spell; worst in 30 years here in KY. He was soon in good shape after a few weeks of treatment. Make sure he has plenty to eat and drink too. Mine lost only the tips of a couple of comb spikes. While I'm at it I'll soon have eggs and later in the season chicks here in Lexington KY.