IGNOU BNS 117 2026 - Describe the levels of prevention of diseases in relation to Nat

Question

Describe the levels of prevention of diseases in relation to Natural history of disease.

05 Aug 2026

Answer :

Word Count : 481

The natural history of disease refers to the course a disease takes in an individual from its initial exposure to a causative agent or risk factor until its final outcome, such as recovery, disability, or death, in the absence of intervention. It is commonly divided into two major phases: the pre-pathogenesis phase and the pathogenesis phase. Understanding this course helps in planning appropriate levels of prevention, particularly in maternal and child health care. The pre-pathogenesis phase occurs before the disease develops. During this stage, the interaction between the host, agent, and environment creates conditions that may lead to disease. Primary prevention is mainly directed at this stage. Its purpose is to prevent the occurrence of

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