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Blood, bone marrow, and urine samples were taken from 25 children with VL during their first clinical episode, 22 days after the start of treatment with liposomal amphotericin B (3 mg\/kg\/day on 6 days over a 10-day period), and when a relapse was suspected during follow-up. The results obtained suggest that antibody detection techniques, the antigen detection in urine (KAtex kit), and<jats:italic>Leishmania<\/jats:italic>nested PCR (LnPCR) analysis of the blood could be used for diagnosis of the first clinical episode. After treatment, clinical improvement was associated with negativization of Novy-MacNeal-Nicolle culture and microscopy of bone marrow aspirate, KAtex test, and LnPCR blood analysis results. Interestingly, LnPCR analysis of the bone marrow aspirate showed that sterile cure was not achieved in eight patients, two of which suffered a relapse within 10 to 20 weeks. All of the new noninvasive techniques tested showed high diagnostic sensitivity. However, LnPCR analysis of the bone marrow was the most sensitive; this test was able to detect the persistence of parasites and predict potential relapses.<\/jats:p>","DOI":"10.1128\/jcm.02297-05","type":"journal-article","created":{"date-parts":[[2006,7,7]],"date-time":"2006-07-07T17:56:08Z","timestamp":1152294968000},"page":"2343-2347","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":83,"title":["Comparison of New Diagnostic Tools for Management of Pediatric Mediterranean Visceral Leishmaniasis"],"prefix":"10.1128","volume":"44","author":[{"given":"Israel","family":"Cruz","sequence":"first","affiliation":[{"name":"WHO Collaborating Centre for Leishmaniasis, Servicio de Parasitologi\u0301a, Centro Nacional de Microbiologi\u0301a, Instituto de Salud Carlos III, Ctra. 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