Communicable disease is an illness caused by a specific infectious agent or its toxic products.It is directly or indirectly transmitted from man to man,animal to man,from the environment(though air,dust,soil,water,food,intermediate host,vector etc) to man.The major prequistes for the spread of communicable disease are give as follow.1>Presence of infectious agents.
2>Presence of susceptible host.
3>Favourable environmental factors for its spread.
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