WHO | Sensitivity and specificity of typhoid fever rapid ...
The original Widal agglutination test was described using paired sera obtained 10 days to 2 weeks apart and examined for a twofold or greater change in titre. 18 It is possible that the Widal test would have performed better in our study had we used paired sera, but we chose to apply the test under the conditions normally found in clinical practice. In our experience, patients rarely return for outpatient …
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