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?

  • -1

 the reason of disease caused 

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