Occurrence and composition of class 1 and class 2 integrons in clinical and environmental O1 and non-O1/non-O139 Vibrio cholerae strains from the Brazilian Amazon

AUTOR(ES)

Sá, Lena Lillian Canto de, Fonseca, Érica Lourenço da, Pellegrini, Maíra, Freitas, Fernanda, Loureiro, Edvaldo Carlos Brito, Vicente, Ana Carolina Paulo

FONTE

Memórias do Instituto Oswaldo Cruz

DATA DE PUBLICAÇÃO

2010-03

RESUMO

This study identified and characterised class 1 and 2 integrons in clinical and environmental Vibrio cholerae O1 and non-O1/non-O139 strains isolated from the Brazilian Amazon. The aadA2 and aadA7 gene cassettes were found in class 1 integrons in two genotypes of environmental V. cholerae non-O1/non-O139. Empty integrons were found in strains from the Brazilian cholera epidemic. A class 2 integron was detected in one strain from the V. cholerae Amazonia lineage harbouring sat1 and aadA1 genes. All isolates were resistant to aminoglycosides, indicating aadA functionality. These findings suggest that environmental bacteria act as cassette reservoirs that favour the emergence of resistant pathogens.

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