I got 6 new hens the other day and stupidly added them straight into the flock. Within 3 days one of the new birds had died from what I think was sour crop, but now one has started sneezing and has gunk coming from its nostrils. I'm pretty sure that this is Infectious Bronchitis. Apart from the nasal discharge, she is perfectly normal, running round with all the other, eating and drinking and gave me the run around trying to catch her. I have separated her from the flock and now not sure what to do. I'm praying the others haven't been infected, I haven't seen any signs. Any advice on how to treat her and possibly the rest of the flock would be very helpful, thanks.