Molecular characterization of Mycobacterium kansasii isolates in the State of São Paulo between 1995-1998

Memórias do Instituto Oswaldo Cruz

Erica Chimara¹  Carmen Maria Saraiva Giampaglia¹  Maria Conceição Martins¹  Maria Alice Da Silva Telles¹  Suely Yoko Mizuka Ueki¹  Lucilaine Ferrazoli¹ 

[1] ,Instituto Adolfo Lutz Seção de Bacteriologia Setor de Micobactérias SP ,Brasil

关键词: Mycobacterium kansasii;    nontuberculous mycobacteria;    hsp65;    restriction analysis;   

DOI  :  10.1590/S0074-02762004000700013

来源: SciELO

【 摘 要 】

Mycobacterium kansasii is the most common cause of pulmonary nontuberculous mycobacteria infection and classical identification of this pathogen needs a time consuming phenotypic tests. Polymerase chain reaction-restriction fragment lenght polymorphism analysis (PRA) of the gene enconding for the 65kDa heat shock (hsp65) protein offers an easy, rapid, and inexpensive procedure to identify and subtype M. kansasii isolates. In the present study, we performed a retrospective analysis of patients who had mycobacteria identified on the basis of phenotypic tests by means of a review of database at Mycobacteria Laboratory of the Instituto Adolfo Lutz in the period 1995-1998. A total of 9381 clinical isolates were analyzed of which 7777 (82.9%) were identified as M. tuberculosis complex and 1604 (17.1%) as nontuberculous mycobacteria. Of the 296 M. kansasii isolates, 189 (63.8%) isolates obtained from 119 patients were viable and were analyzed by PRA-hsp65. Hundred eight two (98.9%) were classified as M. kansasii type I. Two isolates were classified as type II and III and five isolates were characterized as other Mycobacterium species. Clinical isolates of M. kansasii in the state of São Paulo was almost exclusively subtype I regardless of HIV status.

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