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There are two types of diseases primary diseases and secondary disease in primary disease 1 is homogenic, pathogenic, iatrogenic homegenic means they arise from the principal of irritant action 2 is pathogenic means they arise from the principal infectious diseases 3 is iatrogenic means they arise from the principal of improper drug action.

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thanku so much dear
1.Immediate cause-they are the real or primary cause, also called first level cause.various micro organisms are included in it
2.Contributory cause-internal factors, second level of causes.
caused by -inadequate diet
-genetic disorders
-improper functioning of body parts
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