NanaKat, I'm so sorry.
This is a bad week to be a chicken at my house, too. Just got back from the vet with my little Cochin pullet (again) and my daughter's chicken. My daughter's chicken isn't going to make it but we're going to give him until tomorrow. My little Cochin pullet is in liver failure and isn't going to make it either. He said e. coli is much worse than Marek's, now I know what he meant. He said I couldn't quit worrying about the next one getting sick until all my birds are dead. It is incredibly common, way more common than Marek's and I wonder how many people think they have Marek's and it's really e.coli? He said a wild bird shedding the virus, flying overhead and pooping in the yard is all it takes although who knows? Stepping in bird poop ANYwhere and dragging it home will do the same thing. He said if any of them get sick to cull them ASAP, that they won't pull through. I didn't realize all this the other day and stupidly thought they could just be given medicine and get over it. Nope. It's here to stay and all the babies been exposed now from walking back and forth and taking care of them. It was quite probably already on the ground before I even put the Cochins and Silkies outside. I still think it was the 6 Sex Link hens I got last June who brought it in. But it could've just as easily been the 12 yr old Guinea, since he's been exposed to about everything all these years I'm sure. He said any adult bird can have it and it's youngsters who can become infected and die. When the adult bird is stressed for any reason or sick from something else that's all it takes for them to start shedding the virus and infecting others, even though they seem fine themselves.
This totally sucks worse than parvo. He said I'll quite possibly lose all the Cochin babies & all the Silkie babies. It's just an ongoing thing. He said the babies that don't look sick now could start showing signs tomorrow or next week or next month. I guess most people just lose birds and don't really know why and don't realize this is what it was. I can manifest itself in so many different ways. Lameness, organ failure, sudden death, respiratory. It's the babies I'm sick to lose. The adults have a lot better chance since most adult chickens already *have it in their systems anyway.