Yellow fever causes an estimated 30,000 deaths each year, out of 200,000 cases. The disease has two phases. In the “acute phase,” symptoms include fever, muscle pain, headache, shivers, appetite loss, nausea, and vomiting. This lasts for 3–4 days, after which most patients recover. But 15% will enter the “toxic phase,” in which fever reappears, along with other symptoms, including jaundice; abdominal pain; vomiting; bleeding from the mouth, nose, eyes, and stomach; and deterioration of kidney function (sometimes complete kidney failure). Half of all patients in the toxic phase die within two weeks; the other half recover.
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