Caracterização genotípica de amostras Escherichia coli isoladas de mastite bovina / Genotypic characterization of Escherichia coli isolated from cows with mastitis

Escherichia coli samples isolated from cases of dairy mastitis in municipalities of Rio de Janeiro State, Brazil, were genotypically compared and Shiga-toxin genes were detected and their prevalence evaluated. Genetically related samples were verified and the referred genes were detected in 14.28% of the cases.

Enterobacterial microbiota on Stomoxys calcitrans external surface.

The current study evaluated the prevalence of enterobacterial agents on the external surface of the stable fly, Stomoxys calcitrans. In addition, this study investigated the presence of virulence genes of enterobacteria. Twenty different species were isolated and identified, Escherichia coli was the most frequent species isolated. The genes stx1, stx2 and/or eae for production of Shiga toxin were present in 13.04% of the E. coli samples.

Microbiota bacteriana em segmentos de mosca do estábulo Stomoxys calcitrans no Brasil: primeiro relato de espécies / Microbiota in Stomoxys calcitrans segments in Brazil: first description of species

This study report the first description of bacterial species recovered from body segments of Stomoxys calcitrans collected in dairy farms from Rio de Janeiro State, Brazil. Eighteen out of 33 isolated and identified species were unknown in stable flies by the worldwide literature. Some of these species have the potential to develop diseases in man and other animals and some others have not been described yet as pathogenic agents.