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I have never heard of spraying to control cholera. Spraying what exactly? Chlorine is an effective disinfectant, solutions of which can be used to decontaminate surfaces such as walls, floors, hands and utensils to prevent transmission of the disease by contact with these surfaces; such solutions are commonly used as part of the hygiene protocols in cholera treatment centres. Chlorine can also be used to disinfect water supplies where free residual chlorine in the water will provide continued protection from further contamination. These are the only common uses of chlorine that I am aware of. John Cod.