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How would a person develop those diseases that don't spread by contact with a sick person ???

Non communicable diseases like Cancer, High blood pressure, Diabetes etc. can be caused by environmental factors (pollution etc.) or lifestyle.  

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some diseases like AiDS are non communicable

but the person can be affected by direct contact with the person.

this includes blood to blood contact ( by syringes)

or a child an also get it from his mother in the womb itself.

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disease like HIV AIDS are non-communicable it spreads in many ways

i)blood-to-blood

ii)infected mother to baby during preganancy

iii)infected mother to baby during breast feeding

iv)sexualcontacts

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