what are the 1st , 2nd & 3rd level cause of the diseases? why are they classified so ?

1st level cause is immediate cause of infection.

2nd level cause is lack of good nourishment.

3rd level cause is poverty.

They are classified so because according to 1st level cause to 3rd level cause the reason become more effective.

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 which reason?

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 the reason of disease caused 

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Levels of Immediate Causes
There exist various levels of immediate causes. For example, if few babies are suffering from loose motions, we can say that an immediate cause of infection or disease is a virus. Such immediate causes of diseases are called first-level causes. At this juncture we may ask that from where this virus come? The answer would be that the virus came from unclean (contaminated) drinking water.We may think why few babies develop loose motions after drinking unclean water in the society. One reason might be that in comparison to others, these few babies are not healthy and, therefore, are likely to get the disease when exposed to risk. Our study may result in question why are these few babies not healthy? The answer would be that perhaps these are under fed (not well nourished). Thus, lack of good nourishment becomes second level cause of the disease the babies suffering from. These babies are not properly fed because they belong to poor house hold. Therefore, poor public services providing unclean drinking water in the region where such babies are living in society, and poverty becomes the third level cause of the disease.
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