Dengue virus

A 51-year-old woman comes to the emergency department for evaluation of myalgias, fever, and a petechial rash for the past two days. She recently returned from a ten-day trip to West Africa. She states she had similar symptoms three years ago, resolved with supportive care at home. The patient's temperature is 39.4 °C (102.9 °F). Pulse is 100/min, respiratory rate 17/min, and blood pressure 90/50 mmHg. She develops petechial lesions over the distal right arm after a blood pressure measurement is obtained using a sphygmomanometer. The remainder of the physical examination is within normal limits. Initial laboratory workup is shown below. Which of the following is the most likely diagnosis?  

Laboratory value
Serum chemistries	Result
Hemoglobin	9.8 g/dL
Hematocrit	30 %
Leukocyte count	2000 /mm3
Platelet count	50,000 /mm3
AST	170 U/L
ALT	200 U/L
Serum creatinine	1.4 mg/dL