Comparison of Leishmania OligoC-TesT PCR with conventional and real-time PCR for the detection of canine Leishmania infection

C Carson, RJ Quinnell, J Holden, LM Garcez, S Deborggraeve, O Courtenay

    Research output: Contribution to journalA1: Web of Science-article

    Abstract

    There is a need for standardization and simplification of the existing methods for molecular detection of Leishmania infantum in the canine reservoir host. The commercially available OligoC-TesT kit incorporates standardized PCR reagents with rapid oligochromatographic dipstick detection of PCR products, and is highly sensitive in humans, but not yet independently validated in dogs. Here we compare the sensitivity of the OligoC-TesT with that of nested kinetoplast DNA (kDNA) PCR, nested internal transcribed spacer-1 (ITS-1) PCR, and a PCR/hybridization protocol, in longitudinal naturally infected canine bone marrow samples for which parasite burdens were measured by real-time quantitative PCR (qPCR). Sensitivity of the OligoC-TesT in infected dogs was 70% (95% C.I. 63-78%), similar to that of kDNA PCR (72%; 95% C.I. 65-80%; P=0.69), but significantly greater than PCR/hybridization (61%; 95% C.I. 53-69%; P=0.007) and ITS-1 nested PCR (54%; 95% C.I. 45-62%; P<0.001); real-time qPCR had the highest sensitivity (91%; 95% C.I. 85-95%; P<0.001). OligoC-TesT sensitivity was greater in polysymptomatic and oligosymptomatic dogs compared to asymptomatic dogs (93%, 74%, and 61%, respectively; P=0.005), a trend also observed in the other qualitative PCR methods tested (P</=0.05). Test positivity increased with increasing parasite burden measured by real-time qPCR: OligoC-TesT and kDNA PCR detected 100% and 99% of positive samples when parasite burden exceeded 74 and 49 parasites/ml, respectively. The OligoC-TesT has high sensitivity for detection of canine Leishmania infections; ease of operation and interpretation are further advantages for veterinary diagnostic laboratories, and for large-scale survey work in developing countries
    Original languageEnglish
    JournalJournal of Clinical Microbiology
    Volume48
    Issue number9
    Pages (from-to)3325-3330
    Number of pages6
    ISSN0095-1137
    DOIs
    Publication statusPublished - 2010

    Keywords

    • B780-tropical-medicine
    • Protozoal diseases
    • Leishmaniasis
    • Leishmania infantum
    • Reservoirs
    • Dogs
    • Detection
    • Comparison
    • Rapid diagnostic tests
    • Molecular diagnostic techniques
    • Oligochromatography
    • PCR
    • Polymerase chain reaction
    • Sensitivity
    • Brazil
    • America-Latin

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