UPDATE: Well, it looks like I am in for more than what I thought. After I went outside today to check on my flock and to empty the quickly freezing water, it appears that I have more than 1 hen with an eye problem. I now have 2 and some chickens that are sneezing. After reading through other posts, I'm convinced I have more going on that what I thought. Apparently there are diseases that do not go away, but now I'm wondering that since my flock (of about 12) have been all together for the last 2 months if there's really much I can do about it, even if I were to cull the whole flock.
I will continue reading other posts, but here's what I have going and would appreciate any comments or links to other posts that might help.
I introduced new pullets to my slightly older chickens (first group was started in April, and new pullets added in November after being quarantined for 3+ weeks). All seemed well, but then my daughter started noticing some slight sneezing about end of November. Now I have sneezing going around the flock. The weather is absolutely brutal with below 0 windchills and freezing temperatures. They have been relocated to their coop and they seem mostly comfortable. I have wood shavings on the floor and in the nest boxes.
I have 2 of the older pullets....one is standard sized, mixed-run and the other is a silkie, separated in a cage in my basement. The standard was the one I noticed first with the swollen eye. I noticed she had very watery stool with dark green "bb" like solids. The silkie I just brought in this afternoon with a weepy eye and she looks a bit disheveled, she also has some mild sneezing. They both were eating and drinking today. My daughter gave them both some yogurt and they seem quite comfortable together in their little pen.
I guess for now, I'll start some basic treatments, but will have to look more into the ramifications of a disease that will always be carried (MS?). If these diseases stay in the soil, and are nearly impossible to get rid of, I don't know what good it will do to cull my birds. I live in an area where there are lots of wild birds around, including songbirds, crows, turkeys, hawks and owls. My chicken's run actually extends into the wooded area in back of my barn, so some type of exposure to wildlife is highly likely. Since my newer birds seemed healthy for a solid 3 weeks, I suppose it can be as likely that this disease was contracted from wild birds??
So, now it seems that I am rambling and will have lots of thoughts going around in my head when I go to bed tonight.
Any impressions from others would be heartily appreciated.