Abstract:
:The availability of some sorts of biological samples which require noninvasive collection methods has led to an even greater interest in applying molecular biology on visceral leishmaniasis (VL) diagnosis, since these samples increase the safety and comfort of both patients and health professionals. In this context, this work aimed to evaluate the suitability of the urine as a specimen for Leishmania infantum kinetoplast DNA detection by real-time quantitative PCR (qPCR). Subsequent to the reproducibility analysis, the detection limit of the qPCR assay was set at 5fg (~0.025 parasites) per μL of urine. From the comparative analysis performed with a set of diagnostic criteria (serological and molecular reference tests), concordance value of 96.08% was obtained (VL-suspected and HIV/AIDS patients, n=51) (P>0.05). Kappa coefficient (95% CI) indicated a good agreement between the test and the set of diagnostic criteria (k=0.778±0.151). The detection of Leishmania DNA in urine by qPCR was possible in untreated individuals, and in those with or without suggestive renal impairment. Fast depletion of the parasite's DNA in urine after treatment (from one dose of meglumine antimoniate) was suggested by negative qPCR results, thus indicating it as a potential alternative specimen to follow up the efficacy of therapeutic approaches. Even when evaluated in a clinically heterogeneous set of patients, the urine showed good prospect as sample for VL diagnosis by qPCR, also indicating a good negative predictive value for untreated suspected patients.
journal_name
J Microbiol Methodsjournal_title
Journal of microbiological methodsauthors
Pessoa-E-Silva R,Mendonça Trajano-Silva LA,Lopes da Silva MA,da Cunha Gonçalves-de-Albuquerque S,de Goes TC,Silva de Morais RC,Lopes de Melo F,de Paiva-Cavalcanti Mdoi
10.1016/j.mimet.2016.10.002subject
Has Abstractpub_date
2016-12-01 00:00:00pages
34-41eissn
0167-7012issn
1872-8359pii
S0167-7012(16)30276-7journal_volume
131pub_type
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