Document Detail

Sensitive and specific detection of Trypanosoma cruzi DNA in clinical specimens using a multi-target real-time PCR approach.
MedLine Citation:
PMID:  22802973     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The laboratory diagnosis of Chagas disease is challenging because the usefulness of different diagnostic tests will depend on the stage of the disease. Serology is the preferred method for patients in the chronic phase, whereas PCR can be successfully used to diagnose acute and congenital cases. Here we present data using a combination of three TaqMan PCR assays to detect T. cruzi DNA in clinical specimens.
METHODS/PRINCIPAL FINDINGS: Included in the analysis were DNA extracted from 320 EDTA blood specimens, 18 heart tissue specimens, 6 umbilical cord blood specimens, 2 skin tissue specimens and 3 CSF specimens. For the blood specimens both whole blood and buffy coat fraction were analyzed. The specimens were from patients living in the USA, with suspected exposure to T. cruzi through organ transplantation, contact with triatomine bugs or laboratory accidents, and from immunosuppressed patients with suspected Chagas disease reactivation. Real-time PCR was successfully used to diagnose acute and Chagas disease reactivation in 20 patients, including one case of organ-transmitted infection and one congenital case. Analysis of buffy coat fractions of EDTA blood led to faster diagnosis in six of these patients compared to whole blood analysis. The three real-time PCR assays produced identical results for 94% of the specimens. The major reason for discrepant results was variable sensitivity among the assays, but two of the real-time PCR assays also produced four false positive results.
CONCLUSIONS/SIGNIFICANCE: These data strongly indicate that at least two PCR assays with different performances should be combined to increase the accuracy. This evaluation also highlights the benefit of extracting DNA from the blood specimen's buffy coat to increase the sensitivity of PCR analysis.
Yvonne Qvarnstrom; Alejandro G Schijman; Vincent Veron; Christine Aznar; Francis Steurer; Alexandre J da Silva
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, U.S. Gov't, P.H.S.     Date:  2012-07-03
Journal Detail:
Title:  PLoS neglected tropical diseases     Volume:  6     ISSN:  1935-2735     ISO Abbreviation:  PLoS Negl Trop Dis     Publication Date:  2012  
Date Detail:
Created Date:  2012-07-17     Completed Date:  2012-11-01     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  101291488     Medline TA:  PLoS Negl Trop Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e1689     Citation Subset:  IM    
Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America.
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MeSH Terms
Chagas Disease / diagnosis*,  parasitology
Child, Preschool
DNA, Protozoan / genetics,  isolation & purification*
False Positive Reactions
Infant, Newborn
Molecular Diagnostic Techniques / methods*
Parasitology / methods*
Real-Time Polymerase Chain Reaction / methods*
Sensitivity and Specificity
Trypanosoma cruzi / genetics*,  isolation & purification
Reg. No./Substance:
0/DNA, Protozoan

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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