Leishmania species in biopsies of patients with different clinical manifestations identified by high resolution melting and nested PCR in an Endemic district in Peru

Abstract

Background: The parasite of the genus Leishmania causes a neglected disease known as leishmaniasis, which has different clinical aspects depending on the species that infects the person and the immune response of the patient. The objective was to determine, using molecular biology, the current circulating species of Leishmania in biopsies of different types of cutaneous leishmaniasis (CL) from the endemic district in the region of "Madre de Dios", Peru.

Methods: The study's 19 samples were obtained in the Huepethue district in the "Madre de Dios" region from patients who were diagnosed for suspected leishmaniasis infection with three clinical manifestations. These were analyzed using kDNA-PCR, Nested-PCR and HRM-PCR to identify the genus of an infecting parasite as well as its species.

Results: kDNA-PCR detected all tests for the genus of Leishmania to be positive, while the Nested-PCR could not detect 20.9% of species (one L. (V.) braziliensis and three L. (V.) amazonensis), and the HRM-PCR detected all species presented in the samples. The most prevalent species was L. (V.) braziliensis (73.7%), and the clinical manifestations were ulcers (63.2%), superficial scabs (5.3%) and diffuse form (5.3%), followed by L. (V.) amazonensis (15.8%), manifesting ulcers (15.6%), and L. (V.) lainsoni (10.5%), manifesting superficial scabs (5.3%) and ulcers (5.3%). L. (V.) braziliensis, L. (V.) amazonensis and L. (V.) lainsoni were detected effectively using HRM-PCR in the samples with different clinical manifestations.

Conclusions: Highlighting the findings of a high diversity of Leishmania species using High Resolution Melting PCR in biopsies with different clinical manifestations of cutaneous leishmaniasis.

Keywords: Clinical manifestations; Cutaneous leishmaniasis; Genotyping; Leishmania; PCR.

Fig. 1

Probable infection sites. *Only L. (L) amazonensis and L. (V) lainsoni are specifically written on the graph, another infection was caused by L. (V) braziliensis. Size in the area in the chart depend of the number of the infected patient. *J16-Bx 1: A code representing biopsies whose origins of the infection could not be identified.

Fig. 2

Map of the zone study.