How often do you lose a chicken to illness? I have lost 5 since August. Three (unvaccinated) died within days of each other. I waited awhile and got some more. Two of the new flock (fully vaxed) died over a month apart. I am baffled. They live in a generously sized tractor that we move to fresh ground every 3-5 days. I change the shavings in the hen house about every 5-6 days. Fresh water daily (bleach out the container daily too ever since the 1st three died). I am wondering if it is something in our yard. I think maybe I should give up. What am I doing wrong?