TABLE 2.

Sensitivities of the Platelia Dengue NS1 Ag test and of the MAC-ELISA related to number of days after onset of fever (n = 266)

Days after onset of feveraNo. of sera testedPlatelia Dengue NS1 Ag testMAC-ELISA
No. of positive testsSensitivity (%)95% CINo. of positive ELISASensitivity (%)95% CI
01515100.078.2-100.0b00.00.0-23.2b
1706187.177.0-93.911.40.0-7.6
2595491.581.3-97.235.11.1-14.2
3403485.070.2-94.3615.05.7-29.8
4251976.054.9-90.6832.015.0-53.5
519842.120.3-66.51684.260.4-96.6
6181794.475.7-99.818100.081.0-100.0b
≥720945.023.1-68.520100.083.1-100.0b
Total266c21781.676.4-86.17226.721.8-32.8
  • a Onset of fever is defined as day 0 if blood samples were collected within the first 24 h following the onset of fever.

  • b One-sided, 97.5% confidence interval.

  • c Patients with a known date of fever onset.