title: Mycobacterium tuberculosis DNA fingerprint clusters and its relationship with RD(Rio) genotype in Brazil.
abstract: Mycobacterium tuberculosis (Mtb) strains designated as RD(Rio) are responsible for a large cluster of new cases of tuberculosis (TB) in Rio de Janeiro. They were previously shown to be associated with severe manifestations of TB. Here, we used three genotyping methods (IS6110 RFLP, spoligotyping, and multiplex PCR) to characterize RD(Rio) and non-RD(Rio) strains from the metropolitan area of Vitória, State of Espirito Santo in southeast Brazil to determine strain diversity and transmission patterns. Strains with identical IS6110 RFLP patterns were considered to belong to a cluster indicative of recent transmission. Between 2000 and 2010, we identified 5470 new TB patients and genotyped 981 Mtb strains. Of these, 376 (38%) were RD(Rio). By RFLP, 180 (48%) of 376 RD(Rio) strains and 235 (40%) of 593 non-RD(Rio) strains belonged to RFLP cluster pattern groups (p = 0.023). Simpson's diversity index based on RFLP patterns was 0.96 for RD(Rio) and 0.98 for non-RD(Rio) strains. Thus, although RD(Rio) strains appear to be comprised of a fewer number of RFLP genotypes, they represent a heterogeneous group. While TB cases caused by RD(Rio) appear more likely to be due to recent transmission than cases caused by non-RD(Rio) strains, the difference is small. These observations suggest that factors other than inherent biological characteristic of RD(Rio) lineages are more important in determining recent transmission, and that public health measures to interrupt new transmissions need to be emphasized for TB control in Vitória.
authors.affiliation: Núcleo de Doenças Infecciosas, Universidade Federal do Espírito Santo, Av. Marechal Campos, 1468 Maruípe, Vitória, ES, Brazil.
authors.forename: Solange Alves
authors.initials: SA
authors.lastname: Vinhas
authors.forename: Moisés
authors.initials: M
authors.lastname: Palaci
authors.forename: Hebert Silva
authors.initials: HS
authors.lastname: Marques
authors.forename: Paola Poloni
authors.initials: PP
authors.lastname: Lobo de Aguiar
authors.forename: Fabíola Karla
authors.initials: FK
authors.lastname: Ribeiro
authors.forename: Renata Lyrio
authors.initials: RL
authors.lastname: Peres
authors.forename: Reynaldo
authors.initials: R
authors.lastname: Dietze
authors.forename: Harrison Magdinier
authors.initials: HM
authors.lastname: Gomes
authors.forename: Philip Noel
authors.initials: PN
authors.lastname: Suffys
authors.forename: Jonathan E
authors.initials: JE
authors.lastname: Golub
authors.forename: Lee W
authors.initials: LW
authors.lastname: Riley
authors.forename: Ethel Leonor Noia
authors.initials: EL
authors.lastname: Maciel
mesh_terms: D000328:Adult; D015373:Bacterial Typing Techniques / Q000379:methods; D016172:DNA Fingerprinting / Q000379:methods*; D004269:DNA, Bacterial / Q000235:genetics; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009169:Mycobacterium tuberculosis / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D012150:Polymorphism, Restriction Fragment Length; D012189:Retrospective Studies; D014397:Tuberculosis, Pulmonary / Q000382:microbiology*
chemical_list: D004269:DNA, Bacterial