The map above shows the distribution of a disease in 2006. There are many different presentations of this disease including asymptomatic infection. Those with symptoms often have an incubation period of 3-14 days before presenting with fever of 5-7 days, fatigue, headache, retroorbital pain, myalgias and arthralgias. Children sometimes present with GI or respiratory tract symptoms. Labs often show leukopenia, thrombocytopenia, and elevated AST.
The dreaded presentation, however, includes shock, hemoconcentration, marked thrombocytopenia, abdominal pain, vomiting, fever of 2-7 days, and spontaneous bleeding. If you inflate a blood pressure cuff on these patients between the systolic and diastolic pressures for 5 minutes, you'll find petechiae.
Challenge: What's the disease?
Image is in the public domain.