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I agree. Marek's can have all kinds of symptoms, their legs do not have to be one forward on back. There are the classical symptoms that everyone can spot. Then there are all the symptoms that are harder to spot. It depends on what the virus is targeting at that time. There are so many variations of symptoms with Marek's and different ages, and how quick they get sick, etc. that aside from thinking it's a possibility, you have to have a good flock history. Like, new chickens in the last few months? Chickens that you got that were not vaccinated day olds or incubated eggs? The only real diagnosis is made with a necropsy. There are no other tests for it.
So, just watch the rest of your flock. If they are a year or older, they may already have some resistance if they've been exposed to Marek's.
ILOVELEGHORNS on post #27 makes some good points on her post.