Widal Test By Card Method. One drop each of undiluted patients' serum samples for the four antigens are placed on the circled card and one drop of each of the four salmonella antigens are added separately. Typhoid or enteric fever is caused by a gram negative bacteria salmonella enterica (salmonella typhi or salmonella paratyphi).
Widal test is an agglutination test which detects the presence of antibodies in patient's serum produced fresh serum, kit containing salmonella antigen (o, h, ah and bh antigens), positive control, widal test card or.
It was named so after the scientist who developed it. Widal test is an agglutination test which detects the presence of antibodies in patient's serum produced fresh serum, kit containing salmonella antigen (o, h, ah and bh antigens), positive control, widal test card or. The test is based on the presence of specific igm and igg antibodies to a specific 50kd omp. 1:80 dilutions salmonella paratyphi ah 1:20 dilutions salmonella paratyphi bh.
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