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Table 5 The sensitivity, specificity, PPV, and NPV of titers of anti TO (≥1:80) and anti TH (≥1:160) Widal tests for diagnosis of typhoid fever from febrile patients in St. Paul’s hospital

From: A comparative study of Widal test with blood culture in the diagnosis of typhoid fever in febrile patients

Measurement O antigen (%) H antigen (%)
Sensitivity 71.4 28.57
Specificity 74.1 86.3
PPV 6.8 5.2
NPV 98.9 97.8