what are the principles of prevention
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- Hygienic conditions should be maintained in the surroundings we live in. ...
- Hygienic conditions should be maintained in the surroundings we live in. ... Safe drinking water should be provided to prevent water-borne diseases.
- Hygienic conditions should be maintained in the surroundings we live in. ... Safe drinking water should be provided to prevent water-borne diseases.Provide a clean environment which prevents the breeding of mosquitoes...
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