I had 31 Silver Grey Dorkings in my original order, I now have 13. We culled if the birds were crippled for a period of time w/o recuperating. It became a quality of life issue with us. We did have a couple of birds who recuped from the illness, but they didn't behave normally. They would eat and drink, and could walk, but they spent most of their time huddled up on the floor or roost and just not doing much or behaving the way chicks behave. They later perished. The remaining 13 seem to be doing well and there have been no signs of the illness in weeks. We do have a younger batch of EE's from a different hatchery that we intend to integrate, but we want them to be much older and have much more developed immune systems before we do.