Genetic studies of virulence factors of avian Escherichia coli strains

Detalhes bibliográficos
Autor(a) principal: Vidotto, Marilda Carlos
Data de Publicação: 1992
Outros Autores: Santos, Diógenes Santiago
Tipo de documento: Artigo
Idioma: por
Título da fonte: Semina. Ciências Agrárias (Online)
Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4603
Resumo: Ten pathogenic E. coli strains were examined for plasmid types and pathogenicity. Some strains were found to produce colicin and to have drug resistance determinants on a single conjugative plasrnid while others harbored apart Col V and H plasmids. These plasmids were derepressed with a transfer frequency of around 10-6 and 10-1 and did not induce serum resistance or virulence in the recipient ceils of E. coli K12 and of normal flora E. coli strains of chickens, it was the verified that, in the strains studied, the serum resistance and the determinants for virulence are coled by cromossomal genes or have their expression dependant on chromossomal genes.  
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spelling Genetic studies of virulence factors of avian Escherichia coli strainsEstudo genético dos fatores de virulência de Escherichia coli aviáriaVirulence factorsAvian Escherichia coliPlasmidsConjugation.Escherichia coliFatores de virulênciaPlasmídiosConjugação. Ten pathogenic E. coli strains were examined for plasmid types and pathogenicity. Some strains were found to produce colicin and to have drug resistance determinants on a single conjugative plasrnid while others harbored apart Col V and H plasmids. These plasmids were derepressed with a transfer frequency of around 10-6 and 10-1 and did not induce serum resistance or virulence in the recipient ceils of E. coli K12 and of normal flora E. coli strains of chickens, it was the verified that, in the strains studied, the serum resistance and the determinants for virulence are coled by cromossomal genes or have their expression dependant on chromossomal genes.   Dez amostras de E. coli patogênicas para aves foram analisadas quanto a associação entre os plasmídios R e Col e a patogenicidade. Foram encontradas amostras com determinantes de resistência a drogas e produção de colicina em um único plasmídio conjugativo e amostras que transportavam plasmídios Col V e R. Estes plasmídios (R e/ou Col) eram desreprimidos, apresentando altas freqüências de transferência (10-1 a 10-6) e não determinavam resistência ao soro, nem virulência em amostras receptoras de E. coli K12 e de flora normal de galinha. Assim, foi verificado que nas amostras estudadas, a resistência ao soro não é codificada por plasmídios e que os determinantes para virulência podem estar em genes cromossomais ou dependem de genes cromossomais para sua expressão.     UEL1992-01-13info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/460310.5433/1679-0359.1992v13n1p61Semina: Ciências Agrárias; Vol. 13 No. 1 (1992); 61-66Semina: Ciências Agrárias; v. 13 n. 1 (1992); 61-661679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELporhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4603/3883Vidotto, Marilda CarlosSantos, Diógenes Santiagoinfo:eu-repo/semantics/openAccess2010-03-03T18:57:16Zoai:ojs.pkp.sfu.ca:article/4603Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2010-03-03T18:57:16Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false
dc.title.none.fl_str_mv Genetic studies of virulence factors of avian Escherichia coli strains
Estudo genético dos fatores de virulência de Escherichia coli aviária
title Genetic studies of virulence factors of avian Escherichia coli strains
spellingShingle Genetic studies of virulence factors of avian Escherichia coli strains
Vidotto, Marilda Carlos
Virulence factors
Avian Escherichia coli
Plasmids
Conjugation.
Escherichia coli
Fatores de virulência
Plasmídios
Conjugação.
title_short Genetic studies of virulence factors of avian Escherichia coli strains
title_full Genetic studies of virulence factors of avian Escherichia coli strains
title_fullStr Genetic studies of virulence factors of avian Escherichia coli strains
title_full_unstemmed Genetic studies of virulence factors of avian Escherichia coli strains
title_sort Genetic studies of virulence factors of avian Escherichia coli strains
author Vidotto, Marilda Carlos
author_facet Vidotto, Marilda Carlos
Santos, Diógenes Santiago
author_role author
author2 Santos, Diógenes Santiago
author2_role author
dc.contributor.author.fl_str_mv Vidotto, Marilda Carlos
Santos, Diógenes Santiago
dc.subject.por.fl_str_mv Virulence factors
Avian Escherichia coli
Plasmids
Conjugation.
Escherichia coli
Fatores de virulência
Plasmídios
Conjugação.
topic Virulence factors
Avian Escherichia coli
Plasmids
Conjugation.
Escherichia coli
Fatores de virulência
Plasmídios
Conjugação.
description Ten pathogenic E. coli strains were examined for plasmid types and pathogenicity. Some strains were found to produce colicin and to have drug resistance determinants on a single conjugative plasrnid while others harbored apart Col V and H plasmids. These plasmids were derepressed with a transfer frequency of around 10-6 and 10-1 and did not induce serum resistance or virulence in the recipient ceils of E. coli K12 and of normal flora E. coli strains of chickens, it was the verified that, in the strains studied, the serum resistance and the determinants for virulence are coled by cromossomal genes or have their expression dependant on chromossomal genes.  
publishDate 1992
dc.date.none.fl_str_mv 1992-01-13
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4603
10.5433/1679-0359.1992v13n1p61
url https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4603
identifier_str_mv 10.5433/1679-0359.1992v13n1p61
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4603/3883
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv UEL
publisher.none.fl_str_mv UEL
dc.source.none.fl_str_mv Semina: Ciências Agrárias; Vol. 13 No. 1 (1992); 61-66
Semina: Ciências Agrárias; v. 13 n. 1 (1992); 61-66
1679-0359
1676-546X
reponame:Semina. Ciências Agrárias (Online)
instname:Universidade Estadual de Londrina (UEL)
instacron:UEL
instname_str Universidade Estadual de Londrina (UEL)
instacron_str UEL
institution UEL
reponame_str Semina. Ciências Agrárias (Online)
collection Semina. Ciências Agrárias (Online)
repository.name.fl_str_mv Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)
repository.mail.fl_str_mv semina.agrarias@uel.br
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