Just thought I would add this link:
https://www.backyardchickens.com/t/741957/not-an-emergency-mareks-in-the-flock
https://www.backyardchickens.com/t/741957/not-an-emergency-mareks-in-the-flock
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We are pretty sure at this point that this is indeed Marek's. We could try testing, but at this point nothing could be done. Everyone is still hanging in there. I got in touch with a Marek's researcher at NCSU. Here's what she said:
Anyway, we are holding steady right now. Affected pullets get hypericum twice a day. Those that went down before I started this treatment are still hanging in there. They get vitamins in their water, brewer's yeast and garlic in their food. I also added some old fashioned oats to their food (not a lot, but it sure gets them eating!). They get two suet feeders full of fresh oregano in the morning (supposedly a potent virucide) and some basil and kale in the afternoon. We kept Pullet 2 and 3 out for a bit, but after talking with the Marek's researcher, we moved them back with the flock. I'll put the individual updates in purple today.