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Health is very precious . Nutrition, habits, exercise and relaxation are essential factors for good health. A person may be regarded as suffering from a disease when his body does not function properly. Minor and major disorders of the body may lead to diseases. Infectious diseases are caused by germs. One way is to use medicines that kill germs.(pathogens) Many vaccines are now available for preventing a whole range of infectious diseases, and provide a disease-specific means of prevention.


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