Glad you were able to see a vet.Well, because that law got passed earlier this year that you can't buy antibiotics without a vet license, I took a few to the vet. He said it was PROBABLY coryza. Gave them some antibiotic powder for the water. I'm a little confused since antibiotics don't help with viruses, which Coryza supposedly is (per vet). Ah well, they've started to recover anyway.
According to this, Coryza is a bacteria:
http://www.thepoultrysite.com/diseaseinfo/82/infectious-coryza/