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Why do we fall ill, , 1. Preventing exposure to these infectious agents, , Waterborne diseases can be prevented by always having safe, and pure drinking water, , Airborne diseases can be prevented by avoiding overcrowded, places in keeping the environment clean, , Vector-borne diseases can be prevented by keeping our, surroundings clean and maintaining public hygiene, , 2. Strengthening the immune system so that if any infectious, agents enter our body it can fight back. This can be made, possible by having healthy food.