Most diseases could be prevented by personal hygiene. If you maintain a clean environment, wash your hands properly as often as possible, bath regularly, drink clean water, handle and prepare food safely, clean frequently used surfaces and objects properly, etc., you will be safe from a lot. Little acts such as these will prevent a lot of diseases.

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Quote text and notes from Wikiquote: Chinyere Ukaga (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.