title: Evaluation of a nested-PCR for mycobacterium tuberculosis detection in blood and urine samples.
abstract: The polymerase chain reaction (PCR) and its variations, such as the nested-PCR, have been described as promising techniques for rapid diagnosis of tuberculosis (TB). With the aim of evaluating the usefulness of a nested-PCR method on samples of blood and urine of patients suspected of tuberculosis we analyzed 192 clinical samples, using as a molecular target the insertion element IS6110 specific of M. tuberculosis genome. Nested-PCR method showed higher sensitivity in patients with extrapulmonary tuberculosis (47.8% and 52% in blood and urine) when compared to patients with the pulmonary form of the disease (sensitivity of 29% and 26.9% in blood and urine), regardless of the type of biological sample used. The nested-PCR is a rapid technique that, even if not showing a good sensitivity, should be considered as a helpful tool especially in the extrapulmonary cases or in cases where confirmatory diagnosis is quite difficult to be achieved by routine methods. The performance of PCR-based techniques should be considered and tested in future works on other types of biological specimens besides sputum, like blood and urine, readily obtainable in most cases. The improving of M. tuberculosis nested-PCR detection in TB affected patients will give the possibility of an earlier detection of bacilli thus interrupting the transmission chain of the disease.
authors.affiliation: Departamento de Imunologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz , Recife, PE , Brasil.
authors.forename: Heidi Lacerda Alves
authors.initials: HL
authors.lastname: da Cruz
authors.forename: Rosana
authors.initials: R
authors.lastname: de Albuquerque Montenegro
authors.forename: Juliana Falcão
authors.initials: JF
authors.lastname: de Araújo Lima
authors.forename: Diogo
authors.initials: D
authors.lastname: da Rocha Poroca
authors.forename: Juliana Figueirêdo
authors.initials: JF
authors.lastname: da Costa Lima
authors.forename: Lílian
authors.initials: L
authors.lastname: Maria Lapa Montenegro
authors.forename: Sergio
authors.initials: S
authors.lastname: Crovella
authors.forename: Haiana
authors.initials: H
authors.lastname: Charifker Schindler
keywords: IS6110 insertion sequence; Mycobacterium tuberculosis; blood; molecular diagnosis; nested-PCR; urine
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