Ill chook

Re reading your post the early problem may have been Coryza as the onset was sudden and the smell is a give away but the latest maybe MG as it's taken some weeks to show.  Coryza is often complicated with MG so this is entirely possible.  Just check you don't have a local wild bird source such as an unusually large number of wild birds from a  rookery, or pigeons or pheasants.  Don't leave drinkers or feeders exposed keep covered in a caged off run if you suspect a wild bird problem.

Note you can use Vanodine (at the recommended concentration given on the bottle) in the drinking water to prevent cross infection.

HF

Hello!! I had similar about a month or so after I first got mine.....a little warren!! I didn't separate them as they had been living closely and I didn't really have the facilities at the time....anyway I rang the vet (ON A SUNDAY??!!?) and was simply advised to bathe the bubbly eye with clean cotton wool and plain cold water and to observe. Plus I threw in some garlic with their water. I think it must have been a stress thing affecting the immune system??? None of the others had bubbly eyes, but they were all wheezing and sneezing, but it cleared up within a couple of days at the most. I'd written them all off though!! 

Redmolly, if my vet advised that i would be changing my vet!! This is a classic example of vets not knowing enough/cant be bothered with treating out girls. We pay for the treatment, we need to demand better services from the vets.

Here here Lizzie!  What crass advice must have been the trainee on call on a Sunday.  

MG has many forms from mild to severe and stress can enduce an outbreak in a dormant condition which none the less can be serious and not to be taken lightly.  Ongoing management is needed even when the visible symptoms disappear and a half responsible vet should have advised yoiu.  MG is vertically transmitted from parent to chick via the egg and carriers should not be breed from.

MG itself is not particularly serious and rarely causes death however it is usually complicated with several other infections most frequently Escherichia coli to provoke chronic respiratory disease (CRD).  In this case it looks like this was a mild infection which wasn't complicated.

The following is a quote from the Poultry Diseases Network,

"MG may remain dormant and cause no disease until the chicken undergoes some stress, so the MG itself is not a killer, in fact, even morbidity is not great. However, an outbreak may be followed quickly by many secondary infections, and it is these that do the damage (5)."

If you are of a medical bent the complete article is worth a read.
http://www.poultrydiseases.net/online/index.php?option=com_content&task=view&id=14&Itemid=26

HF