1. Infectious diseases are diseases that are caused by pathogens and are capable of spreading from a diseased person to a healthy person.

    Infectious diseases are diseases that are caused by pathogens and are capable of spreading from a diseased person to a healthy person.

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  2. Acquired diseases are those diseases which one individual picks up after birth.

    Acquired diseases are those diseases which one individual picks up after birth.

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  3. Congenital diseases are the diseases found in an individual right from birth.

    Congenital diseases are the diseases found in an individual right from birth.

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  4. Contributing causes are factors which make an individual prone to catch a disease, e.g., undernourishment, defective heredity, poor public health services.

    Contributing causes are factors which make an individual prone to catch a disease, e.g., undernourishment, defective heredity, poor public health services.

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  5. Immediate, precipitating or first level of cause of a disease is the actual agent or factor that causes the disease, e.g.,Virus in common diarrhoea.

    Immediate, precipitating or first level of cause of a disease is the actual agent or factor that causes the disease, e.g.,Virus in common diarrhoea.

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