Table 2.

Results of AAC-ELISA and MAC-ELISA with reference sera and sera from patients with other febrile illnesses

Days after onsetCapture ELISANo. of samples with the following result:% Sensitivity (95% CI)a% Specificity (95% CI)% Positive predictive value (95% CI)% Negative predictive value (95% CI)% Accuracy (95% CI)
TotalTrue positiveFalse positiveTrue negativeFalse negative
1–29IgA2728001048848 (40–55)100 (97–100)100 (96–100)54 (47–61)68 (62–73)
IgM2729431017456 (48–63)97 (93–99)97 (92–99)58 (50–65)72 (66–77)
6–25IgA132520800100 (94–100)100 (96–100)100 (94–100)100 (96–100)100 (97–100)
IgM132523770100 (94–100)96 (90–99)94 (82–97)100 (96–100)98 (94–99)
AllIgA2908501129348 (40–55)100 (97–100)100 (96–100)55 (48–61)68 (63–73)
IgM29010331097558 (51–65)97 (93–99)97 (93–99)59 (52–66)73 (68–78)
  • a 95% CI, 95% confidence interval.