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Sensitivity, specificity, PPV and NPV of titres for anti-O (≥1:80) and anti-H (≥1:160) Widal tests in the diagnosis of typhoid fever among febrile patients in Enugu, Nigeria
| Measurement | O antigen (%) | H antigen (%) |
Both antigens (%) |
| Sensitivity | 55.3 | 0.9 | 49.1 |
| Specificity | 93.3 | 95.5 | 90.7 |
| PPV | 57.7 | 16.2 | 46.2 |
| NPV | 92.7 | 86.0 | 91.6 |
PPV, positive predictive value; NPV, negative predictive value
