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Chickens dont get colds like humans, they get a specific disease and it doesnt go away when treated. They remain carriers for life and can spread the disease to other chickens. Antibiotics treat the symptoms, but never cure the disease. DE is silica and can definitely cause sneezing.
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I'm glad you've kept your other chicks away from the older birds. However there are respiratory diseases that can be transmitted airborne. First, is there anything in the environment causing them to sneeze? Examples could be dust from their feed especially if it's crumbles, smoke...