Diagnostic Efficacy of Molecular Techniques for Detection and Identification of Leishmania Species in Human Whole Blood and Skin Samples from Ecuador

Erika B. Muñoz Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Stephanie Santander Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Patricio Rojas-Silva Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Paul A. Cardenas Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Marco Fornasini Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Sara C. Cifuentes Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Daniela Salvador Instituto Ecuatoriano de Seguridad Social, Quito, Ecuador.

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Manuel E. Baldeón Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Quito, Ecuador.

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Microscopic examination is the standard method for diagnosis of cutaneous and mucocutaneous leishmaniasis despite its low sensitivity. This study compared the diagnosis efficacy of microscopic examination versus polymerase chain reaction (PCR)–based methods and DNA sequencing using whole blood and skin lesion samples from patients with suspected leishmaniasis. The presence of Leishmania was determined by microscopy and amplification of 18S ribosomal RNA gene from blood and skin samples of 22 patients. Twenty individuals were positive for leishmaniasis. Microscopic analysis identified 85%, whereas PCR identified 100% of positive cases from skin and 90% from blood. Cytochrome b gene (cyt-b) amplification and sequencing identified Leishmania guyanensis, Leishmania shawi, and Leishmania naiffi from skin and blood samples. This study demonstrated the usefulness of whole blood and molecular techniques for the diagnosis and species identification of leishmaniasis.

Author Notes

* Address correspondence to Manuel E. Baldeón, Centro de Investigación Traslacional, Universidad de Las Américas (CIT-UDLA), Calle Jose Queri, Entre Avenida Granados y Eloy Alfaro, S/N, Quito 170503, Ecuador. E-mail: manuel.baldeon@udla.edu.ec

Authors' addresses: Erika B. Muñoz, Stephanie Santander, Patricio Rojas-Silva, Paul A. Cardenas, Marco Fornasini, Sara C. Cifuentes, and Manuel E. Baldeón, Centro de Investigación Traslacional, Universidad de Las Américas, Quito, Ecuador, E-mails: erika.munoz@udla.edu.ec, chefasan@hotmail.com, patricio.rojas@udla.edu.ec, paul.cardenas@udla.edu.ec, marco.fornasini@udla.edu.ec, s.cifuentes@udlanet.ec, and manuel.baldeon@udla.edu.ec. Daniela Salvador, Emergencia, Instituto Ecuatoriano de Seguridad Social, Quito, Ecuador, E-mail: dani_salvador88@hotmail.com.

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