AUTHOR=Jiang Haiqin , Shi Ying , Chokkakula Santosh , Zhang Wenyue , Long Siyu , Wang Zhenzhen , Kong Wenming , Long Heng , Wu Limei , Hu Lihua , Yao Qiang , Wang Hongsheng 

TITLE=Utility of Multi-target Nested PCR and ELISPOT Assays for the Detection of Paucibacillary Leprosy: A Possible Conclusion of Clinical Laboratory Misdiagnosis

JOURNAL=Frontiers in Cellular and Infection Microbiology

VOLUME=12

YEAR=2022

URL=https://www.frontiersin.org/journals/cellular-and-infection-microbiology/articles/10.3389/fcimb.2022.814413

DOI=10.3389/fcimb.2022.814413

ISSN=2235-2988

ABSTRACT=<p>The diagnosis of paucibacillary (PB) leprosy often possesses a diagnostic challenge, especially for pure neuritic and lesser skin lesions with the zero bacillary load, requiring a sensitive and accurate diagnostic tool. We have included 300 clinically diagnosed new leprosy cases (comprising 98 PB cases) and analyzed the sensitivity and specificity of PB leprosy cases by nested PCR with <italic>folP</italic>, <italic>gyrA</italic>, <italic>rpoB</italic>, <italic>RLEP</italic>, and <italic>16SrRNA</italic> and Enzyme-linked Immunospot Assay test (ELISPOT) with MMPII, NDO-BSA, and LID-1 antigens by detecting interferon gamma (IFN-γ) release. The overall positivity rates of genes tested in 300 clinical specimens were identified as 55% of <italic>16SrRNA</italic>, 59% of <italic>RLEP</italic>, 59.3% of <italic>folP</italic>, 57.3% of <italic>rpoB</italic>, 61% of <italic>gyrA</italic> while 90% of nested <italic>folP</italic>, 92.6% of nested <italic>rpoB</italic>, and 95% of nested <italic>gyrA</italic>, and 285 (95%) of at least one gene positive cases. For PB specimens, 95% PCR positivity was achieved by three tested genes in nested PCR. The data obtained from ELISPOT for three antigens were analyzed for IFN-γ expression with 600 subjects. Among 98 PB leprosy cases, the sensitivity of MMP II, LID-1, and NDO-BSA was 90%, 87%, and 83%, respectively, and the specificity was 90%, 91%, and 86%, respectively. The total number of cases positive for at least one antigen was 90 (91.8%) in PB, which is significantly higher than that in multibacillary (MB) leprosy (56.7%). The combination of multi-targets nested PCR and ELISPOT assay provides a specific tool to early clinical laboratory diagnosis of PB leprosy cases. The two assays are complementary to each other and beneficial for screening PB patients.</p>