Table 2. Positive predictive value of signs and symptoms among 77 travelers from the Middle East tested for MERS-CoV, Enhanced MERS-CoV Surveillance System, England, September 2012–October 2013* .

Signs and symptoms	No. MERS CoV–positive/no. tested	Positive predictive value, % (95% CI)
Fever, cough; no pulmonary parenchymal involvement	0/3	0 (0–71†)
Fever, cough, and pulmonary parenchymal involvement	2/18	11 (1–35)
Fever, cough, and pulmonary parenchymal involvement requiring mechanical ventilation	2/4	50 (7–93)
Fever, cough, pulmonary parenchymal involvement, and acute respiratory distress syndrome	2/4	50 (7–93)
Fever, cough, and pulmonary parenchymal involvement requiring extracorporeal membrane oxygenation	2/2	100 (16–100)

*MERS-CoV, Middle East respiratory syndrome coronavirus.
†1-sided, 97.5% CI.