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Serodiagnosis of Typhoid Fever in Pediatric Patients by Anti-LPS (Lipopolysaccharide) ELISA (Enzyme Linked Immunosorbent Assay)

机译:抗Lps(脂多糖)ELIsa(酶联免疫吸附试验)对儿科患者伤寒的血清学诊断

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Enzyme-linked immunosorbent assay (ELISA) and immunoblot analysis showed that up to 50% of the anti-typhoid antibody in sera from blood culture positive pediatric typhoid fever patients is directed against lipopolysaccharide (LPS) antigen. Anti-Salmonella typhi LPS ELISA was therefore compared to Widal agglutination for serodiagnosis of typhoid fever in pediatric patients. Sera from 38 pediatric control individuals were ELISA negative for anti-S. typhi LPS IgG; all but 2 of these specimens were negative for anti-S. typhi LPS IgM. Pediatric patients hospitalized with signs and symptoms of typhoid fever were separated into 4 groups and tested by ELISA with the following results: 46 patients negative by both culture and widal agglutination test, 48% positive for anti-S. typhi LPS IgG and 35 % for anti-S. typhi LPS IgM; 22 negative by culture but with positive Widal titres, 82% and 68% positive respectively; 28 culture positive for S typhi, 93% and 82% respectively; and 12 culture positive for Salmonella other than S. typhi, 92% and 92% respectively. These data suggest that anti-S. typhi LPS ELISA is a suitable assay for diagnosis of typhoid fever in children. Reprints. (aw)

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