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Marek's vaccine only helps chickens develop resistance and it helps prevent Marek's tumors, but they can still get the disease. The most common symptom is an inflamed sciatic nerve, which it appears this bird may have. There's every reason to believe the rest of the chickens will be okay...

Have you noticed if this Marans' pupils are unequal? It may just be the left eye is half hidden, but if the pupil is smaller or misshapen, there could be brain damage. That would also account for the lameness. If the weather has been extremely hot, heat stroke can produce similar symptoms. Try...