I need all the advice I can get on this. I've had 3 chickens die over the last month and now my rooster is showing same symptoms. All the chickens that have died and rooster are between 6 months- 2 years old. Usually in the chickens the first sign was that they stopped laying for no apparent reason. (days are getting longer, still eating at this point seemingly fine, and a couple of hem only started re-laying after they had stopped over winter). After a week or so, they clearly became weak, lost weight, were getting really skinny, were not moving around much, listless, hunched wit tail feathers down, drooping wings and whilst they seemed to be drinking ok, at this stage they were hardly eating, even treats were only being nibbled at. All previous chickens showing these symptoms died after a couple of weeks in this listless state. they all had somewhat greenish diarrea. (this happened to the 3 chickens one after the other). Now my rooster is showing the same symptoms (after the last one died only 5 days ago), but his diarrea is clearly green, and I did not notice in the other chickens, but he has a fever, he is clearly a lot hotter to touch than the other chickens. He has obviously stopped crowing also in this listless state. They have been treated for external parasites, they are in the clear it is not mites or lice. It is also not worms. No signs of respiratory disease are visible in the ones that get like this and die, although my flock is positive in mycoplasma or coryza (or one of the other respiratory disease, not sure which one but I think mycoplasma). It is not any other vermin around the yard either, I do not have any mice or rats. It is nothing to do with crop issues either, have checked. What is going on with my flock?