Bacterial suspension which carry antigen will agglutinate on exposure to antibodies to Salmonella organisms. The main principle of widal test is that if homologous antibody is present in patients serum, it will react with respective antigen in the reagent and gives visible clumping on the test card and agglutination in the tube. My daughter had been immunized for Typhoid.
Pre analytical errors have a major impact on diagnostic accuracy of laboratory results. There have been tremendous work and established quality control criteria for analytical phase of testing but there is paucity of standards for pre analytical phase. Recommendations for sample collection, storage, processing and transport have been developed by national and international consensus.
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