How can we prevent the following disease...

How can we prevent the following diseases?
(a) Cholera
(b) Typhoid
(c) Hepatitis A

MICROORGANISMS : FRIEND AND FOE
NCERT EXEMPLAR|Exercise SHORT ANSWER QUESTIONS|3 Videos
MATERIALS : METALS AND NON - METALS
NCERT EXEMPLAR|Exercise LONG ANSWER QUESTIONS|1 Videos
POLLUTION OF AIR AND WATER
NCERT EXEMPLAR|Exercise LONG ANSWER QUESTIONS|7 Videos

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