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Given any four factors necessary for a h...

Given any four factors necessary for a healthy person.

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(1) Environment (i) A clean physical environment with the help of public health services (ii) A congenital social environment.
(2) Personal hygiene. Personal cleanliness pervents catching up of infectious diseases.
(3) Nourishment. Intake of a proper balanced diet keeps the immune system strong.
(4) Vaccination Timely vaccination against major disease (e.g., polio, T.B., chicken pox, etc.) protects one self from catching those diseases.
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