INFECTIOUS AND CONTAGIOUS

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What does infectious disease means ?
And what does contagious disease means?
What is the difference between them ?

First
Contagious disease is that one which can be easily transmitted by any way like air water inhalation and also by contact
e.g : influenza epidemic

Infectious disease disease can be transmitted from one to another but it needs a vector any vector as syringe , blood , and many other way but not transmitted by inhalation

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