Hi Ten Chicks,
I didn't mean to be disagreeable, I was only sharing my experience and my approach. We each might do things differently, which is why this forum is so helpful as someone finding their own way can hear different approaches. All of our situations are different too, which leads to different courses of action. Yes, cocci is a killer, no doubt, yet as I shared in my description, there can be other extenuating circumstances. Just sharing other things to think about is all.
Could you share the titles of your vet manuals? I'm always up for another great chicken health resource. I shared my resource above, which states Vitamin A and K but I'm sure it could be B as well. Many scholarly resources indicating the use of coccidiostats, even for just the 5 day period, degrades vitamins A and K. I'd have to look it up but I believe the reason is that several of the protozoa types use these vitamins to multiply and the coccidiostats work by depleting these nutrients.
But in case it helps, I use a lot of different scholarly resources so in case it helps others, here are a few of them. I only use scholarly resources as there is so much on the internet (and in BYC) that is not necessarily factual. I always try to remember to state my source too so people know where I'm getting the info.
http://avianmedicine.net/publication_cat/avian-medicine/
http://www.merckmanuals.com/vet/poultry/coccidiosis/overview_of_coccidiosis_in_poultry.html
http://www.cabi.org/isc/fulltextpdf/2009/20093257328.pdf
http://edis.ifas.ufl.edu/ps044
In addition, I don't understand when you say that my chicken died from "classic cocci symptoms" as I didn't share what the symptoms were! The symptoms/conditions were: the perfect age for Marek's, unbalanced, difficulty walking, eventual paralysis with one leg forward, one back, irregular iris but eating well and acting fairly normal otherwise. The iris is the tell-tale symptom, the others could be something else, but the iris... Marek's, I'm afraid. I only wish it had been cocci as Marek's is untreatable and results in pretty much 100% mortality when it moves from dormant to the active stage of the virus. The other chicken, the one with the florescent green poo, tinged with yellow, was possibly due to a toxin she ingested. I free range (no run, no fence) so she could have gotten something that made her sick. Even moldy grain can cause this. But nowhere does florescent green poo with some yellow in it show up as a symptom for cocci, not that I've ever run across at least. If you have a reference for this, I'd be interested in that one too. Always up for learning new things.
It can be challenging to diagnose chicken disorders. Many things look like other things. It's great to hear different approaches and perspectives. That's what I like most about learning from everyone here.
In the morning, I'll have a good indication on if my decision to not medicate with Corid was the right one or not. I wrote down where everyone was roosting so I will be able to confirm which chicken it is and isolate that one. I tried to keep an eye on them today and on their poo as I did my farm chores and I didn't/couldn't find any red poo. I even watched every one of them poo at least once and checked it out, no blood. But I know cocci doesn't produce blood on every poo. Ah well... time will tell. I hope my backyard diagnosis was right...!
Thanks much,
Guppy