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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 99, No. 5, 2004, pp. 509-512
Bioline Code: oc04109
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 99, No. 5, 2004, pp. 509-512

 en SHORT COMMUNICATION - Detection of Mycobacterium leprae check for this species in other resources DNA by Polymerase Chain Reaction in the Blood and Nasal Secretion of Brazilian Household Contacts
Elza Carmen de Almeida; Alejandra Nóbrega Martinez; Viviane Câmara Maniero; Ana Maria Sales; Nádia C Duppre; Euzenir Nunes Sarno; Adalberto Rezende Santos & Milton Ozório Moraes


DNA samples from blood and nasal swabs of 125 healthy household contacts was submitted to amplification by polymerase chain reaction (PCR) using a Mycobacterium leprae check for this species in other resources -specific sequence as a target for the detection of subclinical infection with M. leprae. All samples were submitted to hybridization analysis in order to exclude any false positive or negative results. Two positive samples were confirmed from blood out of 119 (1.7%) and two positive samples from nasal secretion out of 120 (1.7%). The analysis of the families with positive individuals showed that 2.5% (n = 3) of the contacts were relatives of multibacilary patients while 0.8% of the cases (n = 1) had a paucibacilary as an index case. All positive contacts were followed up and after one year none of them presented clinical signs of the disease. In spite of the PCR sensitivity to detect the presence of the M. leprae in a subclinical stage, this molecular approach did not seem to be a valuable tool to screen household contacts, since we determined a spurious association of the PCR positivity and further development of leprosy.

Mycobacterium leprae - polymerase chain reaction - healthy contacts - early diagnosis

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