His infection actually resolved. I did not need to inject him luckily. But thank you for the advice, because this could come in handy next time if I need help.
What dosage did you give you chicken of injectable penicillin and what brand did you buy? I have a rooster who got a comb wound that may be infected, and I would like to start him on an antibiotic. I was looking at VetOne Vetripen G. Any info would be helpful