A third unhappy ending for my flock this spring/summer. This hen died the day before yesterday. Her crop emptied the night before and I was hopeful that morning, but she was still unwilling to eat anything at all. I got some clotrimazole into her but that intervention seemed to take the very last of her strength. She drank almost nothing that day and was gone by the evening.
I still believe this has been an infectious bronchitis journey that has now gone on for over three months. One hen died quite a while ago and quite suddenly - though she had struggled with parasite load and shell-less egg issues even before the sneezing hit the flock (really, almost since we got her in the fall of 2021). The next one had always been a solid layer and developed reproductive/shell-less egg issues after the sneezing had been present for a couple of weeks, and she hung on despite low appetite for close to 2 weeks.
This last hen, the sweetest of the bunch (called Leia, though she didn't turn out to have the many lives of the princess), seemed okay up until last Sunday - though I think some watery poops had turned up a few days ahead of that. She hasn't been laying for a while so I don't if reproductive issues were part of her demise, but I do wonder she had liver issues as someone contemplated earlier in this thread. Over the course of the 5 days of her acute illness, I tried calcium (in case of egg/shell issues), Safeguard (in case she was dealing with parasites), and clotrimazole (in case of yeast/sour/slow crop). My heart tells me the most likely explanation is side effects of the IB.
I don't think we will get her necropsied, given the rest of my flock has already been exposed to whatever has killed these hens. I have lost 3 out of 4 of my 2 year olds (2 Production Reds and one Rhodebar). My 4-ish year old hens seem to be okay, though there is still the odd sneeze from my Easter Egger roo and the remaining young hen, who is a Buff Chantecler).
Chicken keeping is sure hard on the soft-hearted. Really hoping this is the end of our losses for this year.

May the force be with us...