Hello, My mother and I live on 5 acres .She has 1 rooster and one hen .They have been free range pets that roost in the trees at night very healthy!. I decided I wanted to get chickens for myself . Built a chicken coop, went out to the flea market (just looking) but felt sorry for to bad looking ducklings and a chicken, so I bought them . didn't notice till too late the hen had a runny nose .well two days later my mothers rooster was very congested and eyes swollen shut and very sleepy and today her hen is very sleepy .I think from research its CRD. went and bought some antibiotics so we will see. My question is can I get more chickens now? I know they are now carriers. can I buy chicks and get them vaccinated? or will I have to let my hen hatch eggs will they be immune? I very much want more chickens . I don't know what to do?