ON SATURDAY MY CHICKEN WAS LIMPING ON ONE LEG, ON SUNDAY SHE COULD BARELY WALK, YESTERDAY AND TODAY SHE IS JUST SITTING IN THE COOP AND CAN NOT REALLY MOVE. SHE IS NOT WHEEZING, HER EYES ARE NORMAL AND CLEAR, BUT SHE WILL NOT EAT OR DRINK. I HAVE GIVEN HER WATER BY A SYRINGE AND TRIED HER WITH A BIT OF SCRAMBLED EGG. SYMPTOMS ARE LIKE MAREK'S, BUT SHE HAS BEEN VACCINATED. I AM GIVING HER ANTIBIOTICS, VITAMIN D AND HYPERICUM IN CASE IT IS MAREK'S.HELP PLEASE