Utility of the Loop-Mediated Isothermal Amplification Assay for the Diagnosis of Visceral Leishmaniasis from Blood Samples in Ethiopia

Dawit Gebreegzabher Hagos, Yazezew Kebede Kiros, Mahmud Abdulkader, Zekarias Gessessew Arefaine, Etsay Nigus, Henk H D F Schallig, Dawit Wolday, Dawit Gebreegzabher Hagos, Yazezew Kebede Kiros, Mahmud Abdulkader, Zekarias Gessessew Arefaine, Etsay Nigus, Henk H D F Schallig, Dawit Wolday

Abstract

Rapid and accurate diagnosis of visceral leishmaniasis (VL) is needed to initiate prompt treatment to reduce morbidity and mortality. Here, we evaluated the performance of loop-mediated isothermal amplification (LAMP) assay for the diagnosis of VL from blood in an endemic area in Ethiopia. LAMP was positive in 117/122 confirmed VL cases and negative in 149/152 controls, resulting in a sensitivity of 95.9% (95% CI: 90.69-98.66) and a specificity of 98.0% (95% CI: 94.34-99.59), respectively. The sensitivity of the LAMP assay was 95.0% (95% CI: 88.61-98.34) in HIV-negatives and 100% (95% CI: 85.18-100.0) in HIV-positives. Compared with microscopy, LAMP detected 82/87 (94.3%, 95% CI: 87.10-98.11) of the microscopy+ cases and was negative in 11/27 (40.7%, 95% CI: 22.39-61.20) of the microscopy- cases. Compared with the rK39 serology, LAMP detected 113/120 (94.2%, 95% CI: 88.35-97.62) of the rK39+ cases and was negative in 149/154 (96.8%, 95% CI: 92.59-98.94) of the rK39- cases. However, when compared with microscopy only, rK39 detected 83/87 (95.4%, 95% CI: 88.64-98.73) of the microscopy+ cases and negative in only 12/27 (44.4%, 95% CI: 25.48-64.67) of the microscopy- cases. There was an excellent agreement between rK39 and LAMP (Kappa = 0.91, 95% CI: 0.86-0.96). Furthermore, an algorithm using rK39 followed by LAMP would yield a sensitivity of 99.2% (95%CI: 95.52-99.89) and a specificity of 98.0% (95% CI: 94.34-99.59). The findings demonstrate that LAMP assay is an accurate and rapid molecular assay for VL diagnosis, including in HIV-1 coinfected patients, in an endemic setting.

Figures

Figure 1.
Figure 1.
Loop-mediated isothermal amplification (LAMP) assay results. Tube 1: positive control; tube 2: negative control; tubes 3, 5, 7, and 9 are positive visceral leishmaniasis (VL) samples; tubes 4, 6, 8, and 10 are non-VL samples. This figure appears in color at www.ajtmh.org

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Source: PubMed

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