Scrub typhus diagnosis on acute specimens using serological and molecular assays — a 3-year prospective study

Munegowda Koralur, Rahul Singh, Muralidhar Varma, Shalini Shenoy, Vasudeva Acharya, Asha Kamath, John Stenos, Eugen Athan, Indira Bairy

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Scrub typhus (ST) is an underdiagnosed acute febrile illness in the Asia Pacific region with recent reemergence. Clinical diagnosis is difficult, and laboratory confirmation is largely based on serological and molecular tests. However, Weil–Felix test still remains the only test available in much of the rural tropics where a disproportionate number of cases occur. Sensitive and affordable assays are important for broader use and accurate diagnosis. We evaluated the diagnostic capabilities of serological and molecular assays on single acute clinical samples. Out of 1036 cases, 319 were confirmed as ST, and the sensitivities of immunofluorescent assay (IFA), IgM enzyme-linked immunosorbent assay (ELISA), nested polymerase chain reaction (n-PCR) and WFT were 93.4%, 80.3%, 75.2%, and 54.2%, respectively. IgM ELISA + n-PCR combination demonstrated highest degree of agreement (κ =.911) in the absence of IFA. Additionally, 16 cases were detected by n-PCR only. Our study emphasizes the diagnostic challenges in the developing world, importance of molecular tests, and best alternate assays in ST diagnosis.

Original languageEnglish
Pages (from-to)112-117
Number of pages6
JournalDiagnostic Microbiology and Infectious Disease
Volume91
Issue number2
DOIs
Publication statusPublished - 01-06-2018

Fingerprint

Scrub Typhus
Prospective Studies
Polymerase Chain Reaction
Immunoglobulin M
Enzyme-Linked Immunosorbent Assay
Serologic Tests
Fever

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)
  • Infectious Diseases

Cite this

Koralur, Munegowda ; Singh, Rahul ; Varma, Muralidhar ; Shenoy, Shalini ; Acharya, Vasudeva ; Kamath, Asha ; Stenos, John ; Athan, Eugen ; Bairy, Indira. / Scrub typhus diagnosis on acute specimens using serological and molecular assays — a 3-year prospective study. In: Diagnostic Microbiology and Infectious Disease. 2018 ; Vol. 91, No. 2. pp. 112-117.
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Scrub typhus diagnosis on acute specimens using serological and molecular assays — a 3-year prospective study. / Koralur, Munegowda; Singh, Rahul; Varma, Muralidhar; Shenoy, Shalini; Acharya, Vasudeva; Kamath, Asha; Stenos, John; Athan, Eugen; Bairy, Indira.

In: Diagnostic Microbiology and Infectious Disease, Vol. 91, No. 2, 01.06.2018, p. 112-117.

Research output: Contribution to journalArticle

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AU - Stenos, John

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