1.

how would a person develop those diseases that do not spread by contact with a sick person

Answer»

It could be due to disease causing microorganisms.

how

like asthama is a non communicable disease causes due to allergies .

not necessary it causes by microorganisms.

It could be itself

You can take example of cancer which causes due to disturbance at cellular level

causes itself

and also non communicable

There are auto immune diseases like rheumatoid arthritis in which the immunity gets destroyed they are not able to Distinguish between self and non self


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