The trouble is the humakti who tries this faces all diseases he wants to clean at once. If he wants to kill all disease in a town, he'll have to face all demons of diseases at the same time. If he fails, he litterally rots away in a few hours, eaten alive by Malia, and his howling ghost stays on the spot.
Also, this ritual is indiscriminate. It might catch along people in the area who are only slightly sick (a cold maybe), or others who are on the way to recovery. It's not something you use lightly.
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