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Clustering of water bodies in unpolluted and polluted environments based on Escherichia coli phylogroup abundance using a simple interaction database Genet. Mol. Biol.
Stoppe,Nancy de Castro; Silva,Juliana Saragiotto; Torres,Tatiana Teixeira; Carlos,Camila; Hachich,Elayse Maria; Sato,Maria Inês Zanoli; Saraiva,Antonio Mauro; Ottoboni,Laura Maria Mariscal.
Different types of water bodies, including lakes, streams, and coastal marine waters, are often susceptible to fecal contamination from a range of point and nonpoint sources, and have been evaluated using fecal indicator microorganisms. The most commonly used fecal indicator is Escherichia coli, but traditional cultivation methods do not allow discrimination of the source of pollution. The use of triplex PCR offers an approach that is fast and inexpensive, and here enabled the identification of phylogroups. The phylogenetic distribution of E. coli subgroups isolated from water samples revealed higher frequencies of subgroups A1 and B2(3) in rivers impacted by human pollution sources, while subgroups D1 and D2 were associated with pristine sites, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: E. coli; Phylogenetic groups; Pollution sources; Interaction networks; Social network analysis.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000500012
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Occurrence of genes encoding enterotoxins in uropathogenic Escherichia coli isolates BJM
Mirzarazi,Mahsa; Rezatofighi,Seyedeh Elham; Pourmahdi,Mahdi; Mohajeri,Mohamad Reza.
To determine the presence of some toxins of diarrheagenic Escherichia coli (DEC) in uropathogenic E. coli (UPEC), 138 urinary tract infection (UTI)-causing UPECs were analyzed. The astA, set, sen and cdtB genes were detected in 13 (9.4%), 2 (1.3%), 13 (9.4%) and 0 (0%) of UPEC isolates respectively. The results show that some genes encoding toxins can be transferred from DEC pathotypes to UPECs therefore these isolates can transform into potential diarrhea-causing agents.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Uropathogenic Escherichia coli; Toxins; Phylogenetic groups; Set; Sen; AstA and cdt genes.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100155
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