I'm sorry for your loss My first thread, I was typing as you were and my advice was too late, sorry.
If it was coccidiosis, no, I doubt she had it when she arrived...although, she might have. Coccidiosis doesn't come from unclean conditions. Even the cleanest most sanitary places can have...
How old was your chick? I would treat everyone for Coccidiosis. Marek's doesn't go by ambulatory or nonambulatory. It strikes in many, many different ways and there is no telling what you are dealing with without a necropsy. However, the age of the bird can be a factor. If under 8 weeks...
The best thing you can do right now is to quarantine any sick birds. There are many things that can mimic Marek's and are not as devastating. How old is your sick bird? If she is less than 8 weeks old, I doubt that you are dealing with Marek's. It just is very rare to see in a young chick...
There is no way, sorry, that anyone can make a Marek's diagnosis without a necropsy. Without one, there are several other diseases that can present and spread like Marek's, you just do not know what you are dealing with. There would be no way that I would accept a diagnosis of Marek's without...
Marek's can cause paralysis in many nerves. My roosters stop crowing once they are symptomatic.
So, she may have injured her leg in a fall. Bring her in and make her comfy. Maybe a little baby aspirin in a cup of water. Follow the vitamin therapy and see what happens. She may just be injured.
You may never get another one that shows symptoms or, it can take up to 4 months for someone to show signs. You really need to find out if it is Marek's you are dealing with. If it is, it will change the way you raise and handle your chickens forever.
I would suggest that you make a mash with crumbles, water and yogurt. She will greedily gobble it up. She will obtain all the moisture she needs from the mash and you won't have to worry about getting water into her. One thing I have noticed repeatedly with Marek's is that the chicken stops...
The incubation period for Marek's ranges from 6 - 16 weeks and sometimes longer. I've found that 12 -14 weeks is the time that you really start having problems. However, I have also discovered that 14 - 16 months is another time when chickens are greatly effected. Unfortunately, I have alot...