I have a Standard female Columbian Wyandotte chick born 8/28/11. I ordered her online, along with 3 other chicks (who seem healthy). All 4 chicks were vaccinated for Mareks at 1 day old and all are female. I first noticed that the Wyandotte chick was wobbly as soon as she arrived in the post. Her crop always seems full but, she seems to forage for food with difficulty; as a result she is half the size of the 3 other chicks. She uses the other chicks or the wall of the brooder to hold herself up. I took her to the Vet when she was 2 days old. I was given a vitamin supplement to help increase her chances but was told there is not much else I can do. She also squawks loudly ALL the time unless held. Has anyone ever had experience with these symptoms? Could the Mareks vaccine have done this to her? Also, how many days does the Mareks virus shed after inocculation? In other words I'm wondering how long to keep the chicks separated from my 6 month bantams who, were never inoculated for Mareks?