Resultado da pesquisa (52)
Termo utilizado na pesquisa colon
#51 - Occurrence of F42 colonization factor in Escherichia coli strains isolated from piglets with diarrhea, p.31-33
Abstract in English:
Penatti M.P.A., Silva A.S., Valadares G.F. & Leite D.S. 2005. Occurrence of F42 colonization factor in Escherichia coli strains isolated from piglets with diarrhea. Pesquisa Veterinária Brasileira 25(1):31-33. Depto Microbiologia e Imunologia, Instituto de Biologia, Unicamp, Campinas, SP 13081-970, Brazil. E-mail: domingos@unicamp.br
The objective of this study was to determine the presence of the colonization factor F42 in 168 strains of Escherichia coli isolated from diarrheic stools of newborn piglets. The presence of F42 in 12 (7.1%) strains was detected with the agglutination test. Through the Polymerase Chain Reaction (PCR) of F42 positive strains, gene encoding enterotoxins (ST-I, ST-II, LT-I and LT-II) were detected. The finding of ST-I/ST-II genes in 50% of the strains, ST-I (16%) and ST-II (25%) indicates a strong association of FC F42 with heat-stable enterotoxins (91%). In contrast, the thermolabile enterotoxin (LT-I and LT-II) genes were not detected. Serogroups of F42 positive strains were determined, serogroup O8 being the most prevalent (41,7%). Other serogroups, as there are O9, O11, O18, O32, O35, O98 and O101, were also identified. Thus, FC F42 was confirmed as an additional factor of virulence in the pathogenesis of porcine colibacillosis.
Abstract in Portuguese:
Penatti M.P.A., Silva A.S., Valadares G.F. & Leite D.S. 2005. Occurrence of F42 colonization factor in Escherichia coli strains isolated from piglets with diarrhea. Pesquisa Veterinária Brasileira 25(1):31-33. Depto Microbiologia e Imunologia, Instituto de Biologia, Unicamp, Campinas, SP 13081-970, Brazil. E-mail: domingos@unicamp.br
The objective of this study was to determine the presence of the colonization factor F42 in 168 strains of Escherichia coli isolated from diarrheic stools of newborn piglets. The presence of F42 in 12 (7.1%) strains was detected with the agglutination test. Through the Polymerase Chain Reaction (PCR) of F42 positive strains, gene encoding enterotoxins (ST-I, ST-II, LT-I and LT-II) were detected. The finding of ST-I/ST-II genes in 50% of the strains, ST-I (16%) and ST-II (25%) indicates a strong association of FC F42 with heat-stable enterotoxins (91%). In contrast, the thermolabile enterotoxin (LT-I and LT-II) genes were not detected. Serogroups of F42 positive strains were determined, serogroup O8 being the most prevalent (41,7%). Other serogroups, as there are O9, O11, O18, O32, O35, O98 and O101, were also identified. Thus, FC F42 was confirmed as an additional factor of virulence in the pathogenesis of porcine colibacillosis.
#52 - Colony types and biochemical characteristics of Clostridium chauvoei isolated from cattle in Brazi
Abstract in English:
The morphological variation of colonies and biochemical characteristics of Clostridium chauvoei, isolated from the metatarsial and metacarpial bones of bovines with a history of blackleg, were investigated. The 59 cultures isolated contained 7 distinct morphological types of C. chauvoei and only 10 (16.95%) showed Type IV growth according to Zeissler (1928). All cultures hydrolized gelatin, had no proteolytic activíty and produced neither lecithinase nor lipase. Only 51 (86.44%) of the 59 cultures showed saccharolytic activity (lactose fermented). The biochemical profile was increased to 29 biochemical tests. The results indicate the morphological heterogenicity and biochemical variations of C. chauvoei in our environment.
Abstract in Portuguese:
A variação morfológica de colônias e do comportamento bioquímico de culturas de Clostridium chauvoei, isoladas de ossos metatarsianos e metacarpianos de bovinos com histórico clínico de carbúnculo sintomático, foi analisada. Das 59 culturas estudadas, observaram-se 7 tipos morfológicos distintos de C. chauvoei e somente 10 (16,95%) apresentaram crescimento do tipo IV. Todas as culturas isoladas hidrolizaram a gelatina, não apresentaram atividade proteolítica e nem produziram lecitinase e lipase. Das 59 culturas testadas 51 (86,44%) fermentaram a lactose (atividade sacarolítica). O perfil bioquímico foi ampliado para 29 provas bioquímicas. Estes resultados demostraram a heterogenicidade morfológica das colônias de C. chauvoei no nosso meio, apresentando variações nos seus parâmetros bioquímicos.
