PROPHYLAXIS

n. treatment for prevention

Prophylaxis (Greek "προφύλαξις" to guard or prevent beforehand) is any medical or public health procedure whose purpose is to prevent, rather than treat or cure, disease. Roughly, prophylactic measures are divided between primary prophylaxis (to prevent the development of a disease) and secondary prophylaxis (whereby the disease has already developed and the patient is protected against worsening of this process).
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Noun
1. the prevention of disease
(hypernym) prevention, bar

(n.)
The art of preserving from, or of preventing, disease; the observance of the rules necessary for the preservation of health; preservative or preventive treatment.
  

The prevention of disease.