We have 12 bantams that are two weeks old. They are not mareks vaccinated. One has a loss of balance on one side and has been tired all the time. It also shakes. We have it isolated. The chicks are in a clear plastic tote with a lamp and pine chips. They have starter/grower feed and water with electrolye. Is this mareks, or something else? If you have an idea what it could be, please answer asap! I need to know if its contagious.