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Hantavirus Pulmonary Syndrome (HPS) is rare but often fatal lung disease transmitted by rodents, primarily deer mice. Humans typically get the disease by breathing small particles of mouse urine or droppings that have been stirred up into the air. Early symptoms such as fever, headaches and muscle aches appear one to six weeks after exposure. Later, patients develop breathing difficulties that range from cough and shortness of breath to severe respiratory failure. HPS was first identified in 1993.

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