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Hantavirus hemorrhagic fever with renal syndrome (HFRS) is a hemorrhagic fever caused by hantaviruses. Symptoms usually occur 2 weeks after exposure to the virus and come in five distinct clinical stages: febrile (toxic), hypotensive, low urine production (oliguric), high urine production (diuretic), and recovery. Early symptoms include headache, lower back pain, nausea, vomiting, diarrhea, bloody stool, the appearance of spots on the skin, bleeding in the respiratory tract, and renal symptoms such as kidney swelling, proteinuria, and hematuria. During the hypotensive phase, blood pressure lowers due to microvascular leakage. Renal failure then causes the diuretic phase, before recovering and increasing urine production as disease progression improves. The severity of symptoms varies depending on which virus causes HFRS and ranges from a mild illness to severe. The case fatality rate likewise varies by virus, at less than 1% up to 15%.
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