Japanese Journal of Infectious Diseases
Online ISSN : 1884-2836
Print ISSN : 1344-6304
ISSN-L : 1344-6304
Short Communications
Molecular Typing of Mycobacterium tuberculosis Strains in Gifu Prefecture, Japan, Using Variable Number Tandem Repeat Analysis
Katsuo KoshiMakiko NodaYukiko KadokuraYoshihiko Kameyama
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2021 Volume 74 Issue 6 Pages 587-591

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Abstract

To investigate the molecular epidemiological characteristics of Mycobacterium tuberculosis strains collected from patients in Gifu Prefecture, Japan, 483 M. tuberculosis clinical isolates were analyzed using Japan Anti-Tuberculosis Association (JATA) 18-variable number tandem repeats (VNTR) between 2015 and 2019. To evaluate the lineage of M. tuberculosis strains, JATA18-VNTR profiles were applied to a maximum a posteriori method. The results revealed that the ancient Beijing subfamily, accounting for 57.3% (277/483) of the strains was the most prevalent M. tuberculosis strain. Furthermore, 18 clusters (GC-1–18) were found by minimum spanning tree analysis. The proportion of clustering strains was 9.9% (48/483), and epidemiological links to these clusters were unclear without GC-6 and GC-18. Meanwhile, interestingly, VNTR profiles of GC-7–9 and GC-14 were indistinguishable from the regional epidemic strains of Nagoya City, which has a strong socioeconomic relationship with Gifu Prefecture, but did not match the nationwide epidemic strains. This study suggests that coordinated analyses within the prefectures with strong socioeconomic relationships are important.

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