Paratyphi C H antigen suspension, c, phase 1 Paratyphi B H antigen suspension, b, phase 1 Paratyphi B 0 antigen suspension, 1, 4, 5, 12 Paratyphi A 0 antigen suspension, 1, 2, 12 The patient’s serum is tested for O and H antibodies (agglutinins) against the following antigen suspensions (usually stained suspensions):.It was developed by Georges Ferdinand Widal in 1896.When facilities for culturing are not available, the Widal test is the reliable and can be of value in the diagnosis of typhoid fevers in endemic areas.Widal Test is an agglutination test which detects the presence of serum agglutinins (H and O) in patients serum with typhoid and paratyphoid fever.
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