Field Evaluation of the Cepheid GeneXpert Chlamydia trachomatis Assay for Detection of Infection in a Trachoma Endemic Community in Tanzania

Alexander Jenson, Laura Dize, Harran Mkocha, Beatriz Munoz, Jennifer Lee, Charlotte A Gaydos, Thomas C Quinn, Sheila K West

Research output: Contribution to journalArticle

Abstract

Purpose: To determine the sensitivity, specificity, and field utility of the Cepheid GeneXpert Chlamydia trachomatis (CT) Assay (GeneXpert) for ocular chlamydia infection compared to Roche Amplicor CT assay (Amplicor). Methods: In a trachoma-endemic community in Kongwa Tanzania, 144 children ages 0 to 9 were surveyed to assess clinical trachoma and had two ocular swabs taken. One swab was processed at Johns Hopkins University, Baltimore MD, using Amplicor, (Roche Molecular Diagnostics) and the other swab was processed at a field station in Kongwa using the GeneXpert Chlamydia trachomatis/Neisseria gonorrhoeae assay (Cepheid). The sensitivity and specificity of GeneXpert was compared to the Amplicor assay. Results: Of the 144 swabs taken the prevalence of follicular trachoma by clinical exam was 43.7%, and by evidence of infection according to Amplicor was 28.5%. A total of 17 specimens (11.8%) could not be processed by GeneXpert in the field due to lack of sample volume, other specimen issues or electricity failure. The sensitivity of GeneXpert when compared to Amplicor was 100% and the specificity was 95%. The GeneXpert test identified more positives in individuals with clinical trachoma than Amplicor, 55% versus 52%. Conclusion: The GeneXpert test for C. trachomatis performed with high sensitivity and specificity and demonstrated excellent promise as a field test for trachoma control.

Original languageEnglish (US)
Article numbere2265
JournalPLoS Neglected Tropical Diseases
Volume7
Issue number7
DOIs
StatePublished - Jul 2013

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Trachoma
Tanzania
Chlamydia trachomatis
Infection
Sensitivity and Specificity
Eye Infections
Electricity
Baltimore
Chlamydia Infections
Molecular Pathology
Neisseria gonorrhoeae

ASJC Scopus subject areas

  • Infectious Diseases
  • Public Health, Environmental and Occupational Health
  • Pharmacology, Toxicology and Pharmaceutics(all)

Cite this

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title = "Field Evaluation of the Cepheid GeneXpert Chlamydia trachomatis Assay for Detection of Infection in a Trachoma Endemic Community in Tanzania",
abstract = "Purpose: To determine the sensitivity, specificity, and field utility of the Cepheid GeneXpert Chlamydia trachomatis (CT) Assay (GeneXpert) for ocular chlamydia infection compared to Roche Amplicor CT assay (Amplicor). Methods: In a trachoma-endemic community in Kongwa Tanzania, 144 children ages 0 to 9 were surveyed to assess clinical trachoma and had two ocular swabs taken. One swab was processed at Johns Hopkins University, Baltimore MD, using Amplicor, (Roche Molecular Diagnostics) and the other swab was processed at a field station in Kongwa using the GeneXpert Chlamydia trachomatis/Neisseria gonorrhoeae assay (Cepheid). The sensitivity and specificity of GeneXpert was compared to the Amplicor assay. Results: Of the 144 swabs taken the prevalence of follicular trachoma by clinical exam was 43.7{\%}, and by evidence of infection according to Amplicor was 28.5{\%}. A total of 17 specimens (11.8{\%}) could not be processed by GeneXpert in the field due to lack of sample volume, other specimen issues or electricity failure. The sensitivity of GeneXpert when compared to Amplicor was 100{\%} and the specificity was 95{\%}. The GeneXpert test identified more positives in individuals with clinical trachoma than Amplicor, 55{\%} versus 52{\%}. Conclusion: The GeneXpert test for C. trachomatis performed with high sensitivity and specificity and demonstrated excellent promise as a field test for trachoma control.",
author = "Alexander Jenson and Laura Dize and Harran Mkocha and Beatriz Munoz and Jennifer Lee and Gaydos, {Charlotte A} and Quinn, {Thomas C} and West, {Sheila K}",
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AU - Jenson, Alexander

AU - Dize, Laura

AU - Mkocha, Harran

AU - Munoz, Beatriz

AU - Lee, Jennifer

AU - Gaydos, Charlotte A

AU - Quinn, Thomas C

AU - West, Sheila K

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