Rare Diseases Symptoms Automatic Extraction

Multi-isotype antibody responses against the multimeric Salmonella Typhi hemolysin (HlyE) antigen.

[typhoid]

The detection and measurement of different antibody isotypes present in the serum are valuable indicators of the different stages of typhoid infection. Here, we investigated the ability of S. Typhi HlyE to detect multi-isotype antibody responses in typhoid and paratyphoid A patients' sera using an indirect antibody immunoassay. We found that nanogram levels of HlyE were sufficient for detection of IgG and IgA isotypes and in a study with individuals' sera (n=100), the immunoassay was able to distinguish typhoid versus non-typhoid sera. The overall sensitivity, specificity and efficiency of the ELISA were 70% (39/56), 100% (44/44) and 83% respectively.