I'm baffled by this situation. We puchased 2 D'anvers about 2 week ago. One male and one female about a year old. The previous owners have had no problems with them or any of their other birds so we don't think its any infection. After one week the male was found laying sideways and showing weekness on his left side. The female is still showing healthy. Our other birds also show no problems. We orignially suspected Marek's and tried the homeopathy remedy yet he does not seem to be responding. We have been hand feeding the male for almost a week. He shows he is hungry as he eats plenty of the mash we feed the birds. He especially likes the cracked corn. But he will not drink water. We were feeding him watermelon so he would get fluids. But he has stopped eating that as well. We switch from well water to filtered water and still won't drink. We are now forcing fluids into the bird using a syringe to pour it in his beak. We were told by an experienced poultry raiser that some birds don't react well to weather changes. We are in Wisconsin and its getting to the 30s and 40s. We keep the coop heated to 60. We have kept him in the house for a week where we keep the temp at 70. Unless we can find something he responds to, we will need to consider putting him down soon. We want to avoid that. I'd appreciate any suggestions or advice from those who have more experience. This is our first year raising chickens.