is leishmania (viannia) braziliensis parasite load associated with disease pathogenesis?

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ID: 217868
2017
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Abstract
Background: Leishmania (Viannia) braziliensis is the main etiological agent of tegumentary leishmaniasis in the Americas. Parasite molecular diversity and host immune status contribute to extensive variations in its clinical presentation within endemic areas of Brazil. Pentavalent antimonials have been used for more than 60 years as the first-line drug for all cases, despite the potential for severe side effects and refractoriness. In Rio de Janeiro, Brazil, most L. (V.) braziliensis infections are benign with a scarcity of parasites, although metastasis and refractory infections can arise. In this scenario, the use of novel molecular tools can be useful for diagnosis and to assess tissue parasitism, and is of benefit to clinical and therapeutic management. Methods: In this study, parasite load was assessed by real-time PCR based on the leishmanial small subunit ribosomal RNA gene. Results and conclusion: The data revealed a tendency to higher tissue parasitism in the skin compared to mucous lesion sites and a reduction with disease progression. Parasite load was lower in poor compared to good responders to antimonials, and was also reduced in recurrent lesions compared to primary ones. However, parasite load became higher with sequential relapses, pointing to an immune system inability to control the infection. Therefore the parasite burden does not seem to be a good predictor of disease progression.
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Authors ;Luiza de Oliveira Ramos Pereira;Regina Barbosa Moreira;Márcia Pereira de Oliveira;Soraya de Oliveira Reis;Manoel Paes de Oliveira Neto;Claude Pirmez
Journal israel journal of chemistry
Year 2017
DOI
10.1016/j.ijid.2017.01.036
URL
http://www.sciencedirect.com/science/article/pii/S1201971217300395
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