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You can not really prevent disease in general.

However:-

It is possible to prevent specific diseases (eg smallpox) by implementing a worldwide program of vaccination.

It is possible to build sewage systems that prevent contamination of drinking water.

It is possible to teach people about personal hygiene and a healthy life style.

It is possible to implement food hygiene laws.

All these help to prevent diseases and improve the health of a population.

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8y ago

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