Answers

2016-01-18T18:16:08+05:30
infectious diseases could be termed those diseases which could be transferred from healthy person to infected person . for example Malaria dengue , tuberculosis etc.

basis of principle of prevention of such diseases are:
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hey by chance my answer has been and wrong so don't read that
2016-01-20T15:10:08+05:30
It is caused by organisem like virus,bacteria it is transmitted to healthful person prevent
prevented by keeping distances to infected person

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