Artículos de revistas
Epidemiological Characterization Of Resistance And Pcr Typing Of Shigella Flexneri And Shigella Sonnei Strains Isolated From Bacillary Dysentery Cases In Southeast Brazil
Registro en:
Brazilian Journal Of Medical And Biological Research. , v. 40, n. 2, p. 249 - 258, 2007.
0100879X
10.1590/S0100-879X2007000200012
2-s2.0-33846964217
Autor
Penatti M.P.A.
Hollanda L.M.
Nakazato G.
Campos T.A.
Lancellotti M.
Angellini M.
Brocchi M.
Rocha M.M.M.
Dias da Silveira W.
Institución
Resumen
Shigella spp are Gram-negative, anaerobic facultative, non-montile, and non-sporulated bacilli of the Enterobacteriaceae family responsible or "Shigellosis" or bacillary dysentery, an important cause of worldwide morbidity and mortality. However, despite this, there are very few epidemiological studies about this bacterium in Brazil. We studied the antibiotic resistance profiles and the clonal structure of 60 Shigella strains (30 S.flexneri and 30 S. sonnei) isolated from shigellosis cases in different cities within the metropolitan area of Campinas, State of São Paulo, Brazil. We used the following well-characterized molecular techniques: enterobacterial repetitive intergenic consensus, repetitive extragenic palindromic, and double-repetitive element-polymerase chain reaction to characterize the bacteria. Also, the antibiotic resistance of the strains was determined by the diffusion disk method. Many strains of S. flexneri and S. sonnei were found to be multi-resistant. S. flexneri strains were resistant to ampicillin in 83.3% of cases, chloramphenicol in 70.0%, streptomycin in 86.7%, sulfamethoxazole in 80.0%, and tetracycline in 80.0%, while a smaller number of strains were resistant to cephalothin (3.3%) and sulfazotrim (10.0%). S. sonnei strains were mainly resistant to sulfamethoxazole (100.0%) and tetracycline (96.7%) and, to a lesser extent, to ampicillin (6.7%) and streptomycin (26.7%). Polymerase chain reaction-based typing supported the existence of specific clones responsible for the shigellosis cases in the different cities and there was evidence of transmission between cities. This clonal structure would probably be the result of selection for virulence and resistance phenotypes. These data indicate that the human sanitary conditions of the cities investigated should be improved. 40 2 249 258 Murray, P.R., Rosenthal, K.S., Kobayashi, G.S., Pfaller, M.A., (1998) Medical Microbiology, , 3rd edn. 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