how would a person develop those diseases that don't spread by contact with a sick person?
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1
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People can develop diseases other than infective diseases either through malnourishment or due to genetic causes. Wrong habits of alcoholism, smoking or drugs can also lead to diseases.
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persons develop diseases by bacterias which may have stick to him or by some malnutritional diseases. some diseases are non cantact diseases , which may be spread in air and when a person inhales , these diseases go into him
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