1. Signs are definite clues or indications of a disease.

    Signs are definite clues or indications of a disease.

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  2. Symptoms are structural and functional manifestations of the presence of a disease.

    Symptoms are structural and functional manifestations of the presence of a disease.

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  3. Non-infectious diseases are the ones which are produced by the factors other than living organisms and are incapable of spreading from one person to another.

    Non-infectious diseases are the ones which are produced by the factors other than living organisms and are incapable of spreading from one person to another.

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