I also suspect MG in the group here due to Hazel's bubbly eyes and Annie & Tedi's illness, but haven't been able to verify it either way. Annie swabbed negative for anything, but that was after antibiotic treatment.
You may recall I've had Hazel's eyes swabbed twice, before any treatment, and come up with negative results both times, though the last one detected e. coli (because of the run dust collected in her eye, we think). $700 for that last visit with all the panels, highest ever.
If MG is as endemic as everyone says, then why not treat it as an unavoidable thing? Thought through this and decided I didn't want to wait until everybody aged out and I certainly wasn't going to cull. I brought in the new Buckeye chicks, and gave them a round of Tylosin when they began sniffling and having clear nasal discharge, and it cleared up quickly. They have been fine since then. A vet online suggested IB as possible but had no problem with the Tylosin saying the antibiotics would be good to help with any secondary infections.
Yes a couple of mine also had the frothy eyes, Mr P a bit, and Daisy was the worst. Also Cayenne a bit. I think dropping some of the Tylosin mixture in their eyes really helped to dry up the moisture.