Serodiagnosis of acute typhoid fever in nigerian pediatric cases by detection of serum IgA and IgG against hemolysin e and Lipopolysaccharide

D. Huw Davies, Aarti Jain, Rie Nakajima, Li Liang, Algis Jasinskis, Medalyn Supnet, Philip L. Felgner, Andy Teng, Jozelyn Pablo, Douglas M. Molina, Stephen K. Obaro

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Inexpensive, easy-to-use, and highly sensitive diagnostic tests are currently unavailable for typhoid fever. To identify candidate serodiagnostic markers, we have probed microarrays displaying the full Salmonella enterica serovar Typhi (S. Typhi) proteome of 4,352 different proteins + lipopolysaccharides (LPSs), with sera from Nigerian pediatric typhoid and other febrile cases, Nigerian healthy controls, and healthy U.S. adults. Nigerian antibody profiles were broad (∼500 seropositive antigens) and mainly low level, with a small number of stronger "hits," whereas the profile in U.S. adults was < 1/5 as broad, consistent with endemic exposure in Nigeria. Nigerian profiles were largely unaffected by clinical diagnosis, although the response against t1477 (hemolysin E) consistently emerged as stronger in typhoid cases. The response to LPS was also a strong discriminator of healthy controls and typhoid, although LPS did not discriminate between typhoid and nontyphoidal Salmonella (NTS) disease. As a first step toward the development of a point-of-care diagnostic, t1477 and LPS were evaluated on immunostrips. Both provided good discrimination between healthy controls and typhoid/NTS disease. Such a test could provide a useful screen for salmonellosis (typhoid and NTS disease) in suspected pediatric cases that present with undefined febrile disease.

Original languageEnglish (US)
Pages (from-to)431-439
Number of pages9
JournalAmerican Journal of Tropical Medicine and Hygiene
Issue number2
StatePublished - Aug 2016

ASJC Scopus subject areas

  • Infectious Diseases
  • Virology
  • Parasitology


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