Contagious vs. Infectious; Do they mean the same thing?

All contagious diseases are infectious, but all infectious diseases are not contagious.  Infectious diseases are caused by pathogens or disease-causing microorganisms. When they get into the body infectious diseases happen.  If the disease spreads through direct contact with the infected person it is contagious.   

A communicable disease is an infectious disease that is contagious that can be transmitted either directly or indirectly from source to another.

Cancer, cardio vascular diseases, diabetes, etc., are noncommunicable diseases.

Malaria and tetanus are examples of infectious diseases that are not contagious.

Covid-19 is a contagious disease.

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