It's good that they seem to be improving. Did you treat them with any medications?
Still hard to know if it's IB or a milder strain of Mycoplasma without testing.
Yes, sort of...there can be secondary infection that would require antibiotic treatment or IB sometimes accompanies another illness like Mycoplasma. IB makes birds carriers for up to a year, so it can be spread around if you don't keep a closed flock during that time (no birds in/out, this...
There are many respiratory diseases - Mycoplasma, Infectious Bronchitis, Infectious Coryza and ILT are fairly common. It would be hard to know which one you are dealing with without testing.
Sneezing, raspy breathing and clear discharge to me sounds more like Infectious Bronchitis since it's...