I think it is humid and rainy in Kenya now. You don't know the conditions under which they were raised up till you got them.
I'm not trying to diagnose from afar, but if it was dactylariosis, when the fungus contaminates sawdust or tree bark used for bedding it takes about 6 days or so to manifest in the chick so that can be the issue if there was any of the fungus in its surroundings since it hatched.
