Since we're all pretending to be epidemiologists...

...and in the interest of the public health I went to the CDC web site and found this information:
Dengue and dengue hemorrhagic fever:
Q. What are the symptoms of the disease?
A. The principal symptoms of dengue are high fever, severe headache, backache, joint pains, nausea and vomiting, eye pain, and rash. Generally, younger children have a milder illness than older children and adults.
Dengue hemorrhagic fever is characterized by a fever that lasts from 2 to 7 days, with general signs and symptoms that could occur with many other illnesses (e.g., nausea, vomiting, abdominal pain, and headache). This stage is followed by hemorrhagic manifestations, tendency to bruise easily or other types of skin hemorrhages, bleeding nose or gums, and possibly internal bleeding. The smallest blood vessels (capillaries) become excessively permeable ("leaky"), allowing the fluid component to escape from the blood vessels. This may lead to failure of the circulatory system and shock, followed by death, if circulatory failure is not corrected.
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West Nile Virus:
Q. What are the symptoms of West Nile encephalitis?
A. Most infections are mild, and symptoms include fever, headache, and body aches, occasionally with a skin rash on the trunk of the body and swollen lymph glands.
More severe infection may be marked by headache, high fever, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, paralysis, and, rarely, death.
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[Required on-topic content: Neither West Nile Virus nor Dengue Fever has yet had any significant impact on the growth and development of soccer in the United States.]
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After all is said and done, more is said than done.