isn't this keet the only one left out of several others that died?
if so, I would keep him seperate from the chickens, inside or outside,
until you're sure he isn't carrying the "bug" and give to the others...
don't know if this is right or wrong, and if wrong maybe others will correct
me so you'll know different, but I would give the keet and chickens
some water dosed with Duramycin-10....it's an antibiotic and can't
hurt...right?....but now thats just me trying to keep everyone healthy....
hope others will read your question and my answer and tell you the best thing to do...
good luck!
