I have 2 barred rock roosters (one now), that I was told had Marek's, one since 8 weeks. The other that just died developed it at 6 months. Both immediately quarantined inside. Both were doing really well, on homeopathic, colostrum, and vitamins. Eating well, perky, etc. except for the paralysis. The homeopathic was working well with my remaining roo. He has been standing with some assistance, getting stronger. Two days ago, one of them developed severe diarrhea and stopped eating and drinking, he died the next day. The one left has been doing great until today when I noticed he was not as enthusiastic about eating and drinking. Not as animated, although alert as usual. I just offered him some scrambled egg, and he ate it with gusto, but I noticed tonight that he is holding his beak open slightly like he is having a hard time breathing, and also his nostrils are somewhat wet, although no sneezing. I have antibiotic and electrolytes with vitamins, so I am thinking I should give it to him. Could this be coccidosis I am seeing here? Both of their cages and bedding were kept clean and dry. Fresh water and food always. Fresh air, as I kept the basement door where they are open all day. And no dampness at all. Any ideas? This is really hitting me hard and I feel like I have somehow let them both down. I have been meticulous about washing and disinfecting waterers, feeders, cages, and coops. These two roos have been quarantined away from my other birds for quite a while but now I am really worried about the other birds. I have two other roos, and a hen, as well as 8 week old Javas that are just now out of the brooder during the day due to warm weather. We put them out in a pen for the day. I use disposable gloves and change them in between birds, I also change clothes and shoes often. Any input would be appreciated. You guys are the greatest with your information.