M:33yr, high fever, high BP patient. S.Typhi "to" 1:80, s.Typhi "th" 1:40, s.Paratyphi "ah" 1:20, s.Paratyphi "bh"1:20, method:slide agglutination-typhiod?

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.