List 3 harmful effects of infectious diseases.

The effects of infectious diseases are:

Some of the infectious diseases are communicable i.e. they spread by contact from infectious person to healthy person. They spread very rapidly in the society. So, one should stay away from an infectious person and wear a mask when you need to contact the infectious person. 
Some of the infectious diseases are water borne and vector borne. They can be fatal like malaria, dengue, etc.  So, for water borne diseases like cholera, diarrhea, etc be ensure proper disposal of sewage and safe drinking water supply. For vector borne diseases, provide a clean environment, which helps in preventing vectors like mosquitoes from breeding. 

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