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Quarantine is the period of isolation necessary to control the spread of infectious disease. Before the era of antibiotics, quarantine was one of the few available ways to stop the spread of infectious diseases. It is still employed as needed. The list of diseases that require quarantine in the US includes: cholera, diphtheria, infectious tuberculosis, plague, smallpox, yellow fever, and viral hemorrhagic fevers and SARS (severe acute respiratory syndrome).
Quality of life is an important consideration in medical care and refers to the patient's ability to enjoy normal life activities. Some medical treatments can seriously impair quality of life without providing appreciable benefit, while others greatly enhance quality of life.