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Change in the structure of Escherichia coli population and the pattern of virulence genes along a rural aquatic continuum 5
Petit, Fabienne; Clermont, Olivier; Delannoy, Sabine; Servais, Pierre; Gourmelon, Michele; Fach, Patrick; Oberle, Kenny; Fournier, Matthieu; Denamur, Erick; Berthe, Thierry.
The aim of this study was to investigate the diversity of the E. coli population, focusing on the occurrence of pathogenic E. coli, in surface water draining a rural catchment. Two sampling campaigns were carried out in similar hydrological conditions (wet period, low flow) along a river continuum, characterized by two opposite density gradients of animals (cattle and wild animals) and human populations. While the abundance of E. coli slightly increased along the river continuum, the abundance of both human and ruminant-associated Bacteroidales markers, as well as the number of E. coli multi-resistant to antibiotics, evidenced a fecal contamination originating from animals at upstream rural sites, and from humans at downstream urban sites. A strong spatial...
Tipo: Text Palavras-chave: Water; Sediment; Pathogenic E. coli; Virulence gene; Shiga toxin.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00378/48887/49328.pdf
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Fate of non O157 Shigatoxigenic Escherichia coli in ovine manure composting 45
Marin,J.M.; Maluta,R.P.; Borges,C.A.; Beraldo,L.G.; Maesta,S.A.; Lemos,M.V.F.; Ruiz,U.S.; Ávila,F.A.; Rigobelo,E.C..
Livestock manure may contain pathogenic microorganisms which pose a risk to the health of animal or humans if the manure is not adequately treated or disposed of. To determine the fate of Shiga toxigenic Escherichia coli (STEC) non O157 in composted manure from naturally colonized sheep, fresh manure was obtained from animals carrying bacterial cells with stx1/ stx2 genes. Two composting systems were used, aerated and non-aerated, and the experiments were done in Dracena city, São Paulo State. Every week, for seven weeks, one manure sample from six different points in both systems was collected and cultured to determine the presence of E. coli, the presence of the virulence genes in the cells, and also the susceptibility to 10 antimicrobial drugs. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterial elimination; VTEC; Environment; Compost; Virulence gene.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000601771
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Occurrence and characteristics of virulence genes of Escherichia coli strains isolated from healthy dairy cows in Inner Mongolia, China 58
Huasai,Simujide; Chen,Aorigele; Wang,Chun-jie; Li,Yu; Tongrige,Bai.
Virulence genes of Escherichia coli (E. coli) isolates from healthy dairy cows were identified and characterized by a multiplex PCR assay and serogrouping test. The results showed that among the target genes, eaeA was most frequently detected, accounting for 22.11% (67/303) in all strains from 101 cows. For categorization of E. coli, aEPEC was the category with widest distribution detected in 55 (18.15%) strains from 22 cattle. All of 84 PCR-positive strains belonged to 14 O serogroups, and O149 (25.00%) was most common identified, followed by O2 (17.86%), O8 (11.90%) and O103 (9.52%) with relatively high prevalence.
Tipo: Info:eu-repo/semantics/article Palavras-chave: E. coli; Virulence gene; Multiplex PCR; Serogroup; Healthy dairy cow.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000200013
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Virulence genes in Escherichia coli isolated from feces and urine of cats 45
Caliman,M.W.; Marin,J.M..
Determinadas linhagens de Escherichia coli comportam-se como patógenos em gatos, causando doenças gastrointestinais e extraintestinais. Neste estudo, foram utilizadas 205 cepas de E. coli isoladas de amostras de fezes provenientes de 19 gatos diarreicos e de 21 gatos não diarreicos, e três amostras de urina provenientes de gatos com infecção do trato urinário (ITU). Essas cepas foram testadas pela técnica de reação em cadeia da polimerase com múltiplos iniciadores para a detecção da presença de genes codificadores de adesinas (pap, sfa e afa), assim como para a detecção dos genes produtores da toxina Shiga-like (stx1 e stx2) e do gene da intimina (eae). Oitenta e dois isolados possuíam genes codificadores de adesinas, dos quais 11 apresentaram o gene pap,...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Pet; Cat; ExPEC; STEC; Adhesins; Virulence gene.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000401287
Registros recuperados: 4
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