title: [Application of mycobacterial interspersed repetitive units in typing Mycobacterium tuberculosis in Shandong].
abstract: OBJECTIVE
  To evaluate the application of mycobacterial interspersed repetitive units (MIRU) in typing Mycobacterium tuberculosis in Shandong.
  
  
  METHODS
  826 strains of M. tuberculosis from laboratories of 12 county tuberculosis dispensaries in Shandong were cultured and typed by MIRU genotyping in the KICID laboratory.
  
  
  RESULTS
  The 826 strains were typed to 201 distinct MIRU patterns, and 123 isolates were unique, 703 strains were grouped into 1 of 78 different MIRU clusters, and the MIRU genotype of the largest cluster was 223325173533. Among the clustered strains, 18 patients had an epidemiological history of contact. The Hunter-Gaston discriminatory index was 0.90. The allelic diversity of the sample was calculated for each other of the MIRU loci, and showed that MIRU26 had 10 alleles and was highly discriminative, while other five MIRU loci (MIRU31, 10, 39, 40, 4) were moderately discriminative. The reproducibility of the MIRU method was 100%. It took about RMB yen50 to genotype one strain.
  
  
  CONCLUSIONS
  MIRU genotyping is a reproducible, fast, simple, and relatively cheap method. But because the isolates of 223325173533 genotype are predominant (30.89% of the isolates) in Shandong Province, it needs a second method IS6110 RFLP or by adding other more discriminative variable-number tandem repeat (VNTR) loci to improve the discriminative power.
authors.affiliation: Katharine Hsu International Research Center of Human Infectious Disease, Shandong Provincial Chest Hospital, Jinan 250013, China.
authors.forename: Hai-ying
authors.initials: HY
authors.lastname: Wang
authors.forename: Cai-hua
authors.initials: CH
authors.lastname: Jiang
authors.forename: Yun
authors.initials: Y
authors.lastname: Zuo
authors.forename: Chun-bao
authors.initials: CB
authors.lastname: Yu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Yun-feng
authors.initials: YF
authors.lastname: Deng
authors.forename: Jun-ling
authors.initials: JL
authors.lastname: Wang
authors.forename: Xian-chun
authors.initials: XC
authors.lastname: Meng
authors.forename: Hui
authors.initials: H
authors.lastname: Jing
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Liu
mesh_terms: D015373:Bacterial Typing Techniques / Q000379:methods*; D002681:China; D005838:Genotype; D006801:Humans; D009169:Mycobacterium tuberculosis / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D020080:Tandem Repeat Sequences; D014376:Tuberculosis / Q000382:microbiology*