Typhoid: A single widal test in an unvaccinated patient showing h and/or o titres greater than or equal to 1:160 and typhoid-like symptoms is strongly suggestive of typhoid fever. It also appears that h titre is more useful than o titre. More false positives are found than false negatives. Under these circumstances, the clinical picture is the decisive factor in making a diagnosis of typhoid.
Answered 3/21/2016
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