Widal test

The Widal test is a serologicaltest for Salmonella typhi.

It is a demonstration of salmonella antibodies against antigens O-somatic and H-flagellar in the blood.

It is used to ascertain the presence of typhoid fever. However, it is not a very accurate method, since we are often exposed to other bacteria (e.g. Salmonella enteritidis, Salmonella typhimurium) in this species that induce cross-reactivity; many people have antibodies against this enteric pathogens, which also react with the antigens in the Widal test, causing a false-positive result. Typhidot is the other test used to ascertain the presence of typhoid fever

Other means of diagnosing Salmonella typhi (and paratyphi) include cultures of blood, urine and feces.

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It uses material from the http://en.wikipedia.org/wiki/Widal+test Wikipedia article Widal test.