This morning I noticed my hen was quiet and puffed up. She had messy feathers by her vent for the past week or two. I tried to catch her a couple of times this past week to clean her but she was a lot faster than I am. Today, I picked her up and brought her in and put her in the tub with warm water and started washing her vent and feathers. I found a broken soft shelled egg partially coming out of the vent. I don't know how long this has been in there. Also had a very foul odor. I pulled out the egg casing and put my fingers inside to see if there was anymore to be pulled out. Just a little bit of pussy ooze came out. After taking her out of the tub, I wrapped her in a towel and used a syringe with sterile water to rinse the vent. The vent was very red and puffy at the opening. I mixed up some Duramycin- 10 with her water and put that in her tub with her, then some laying crumbles and plain yogurt. I read here on BYC that Duramycin- 10 is to prevent infection not cure it so I went to Tractor Supply and bought penicillin and 16 guage needles. I just gave her 1 shot of penicillin ( 1/4 cc ). My question is, when do I give her the next shot? Just 1 shot per day? Also is there anything else I should be doing? Should I rinse her vent again tonight or tomorrow? Thank-you for your help.