Whole-Blood Nested-PCR Amplification of M. leprae-Specific DNA for Early Diagnosis of Leprosy

Yan Wen Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland

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Yan Xing Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland

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Lian-Chao Yuan Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland

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Jian Liu Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland

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Ying Zhang Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland

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Huan-Ying Li Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland

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We evaluated the sensitivity and specificity of a nested-polymerase chain reaction (PCR) method for detection of Mycobacterium leprae DNA from whole blood. Whole-blood specimens were subjected to nested-PCR amplification of M. leprae repeat DNA sequences in 49 multibacillary (MB) and 30 paucibacillary (PB) leprosy patients, 96 household contacts (HHCs), 18 tuberculosis (TB) patients, and 35 normal healthy individuals. M. leprae DNA was detected in 95.92% (47/49) of MB, 70% (21/30) of PB, and 6.25% (6/96) of HHC, but it was not detected in 18 TB or 35 normal controls. The sensitivities of the anti-bovine serum albumin (ND-O-BSA) immunoglobulin M (IgM) and antifusion protein of ML0405-ML2331 IgG for MB were 97.96% and 89.8%, and these values for PB were 70% and 53.33%. However, the ND-O-BSA enzyme-linked immunosorbent assay (ELISA) had lower specificity, with relatively high false-positive results for TB patients (16.67%) and normal healthy controls (10%). Based on these promising findings, we propose the use of nested PCR of whole-blood samples along with ELISA test for early detection of leprosy cases.

Author Notes

* Address correspondence to Huan-ying Li, Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, 100050, China, E-mail: lihybj@163.com, and Ying Zhang, Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, E-mail: yzhang@jhsph.edu.

Authors' addresses: Yan Wen, Capital University of Medicine Affiliated Beijing Friendship Hospital, Beijing Tropical Medicine Research Institute, Beijing, China, E-mail: weny8@163.com. Yan Xing, Lian-Chao Yuan, Jian Liu, and Huan-Ying Li, Department of Leprosy Research, Beijing Tropical Medicine Research Institute, Beijing, China, E-mails: xingyan@163.com, yuanlianchao@126.com, liujian@sina.com, and lihybj@163.com. Ying Zhang, Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, E-mail: yzhang@jhsph.edu.

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