Because functioning of immune system will not be good if proper and sufficient food and nourishment is not available.
(i) For air borne microbes, we can prevent exposure by providing living condition that are not overcrowded.
(ii) For water borne microbes, we can prevent exposure by providing safe drinking water.
(iii) For vector borne diseases, we can prevent exposure by providing clean environment.
Justify the following statements : (a) "Availability of proper and sufficient food would prevent infectious diseases." (b) "The general ways of preventing infection mostly relate to preventing exposure”. List three points of prevention of exposure