Virulence factors of Escherichia coli isolated from calves with diarrhea in Brazil

Brazilian Journal of Microbiology

Márcia Regina Salvadori²  Geórgio Freesz Valadares²  Domingos Da Silva Leite²  Jesús Blanco¹  Tomomasa Yano² 

[1] ,Universidade Estadual de Campinas Instituto de Biologia Departamento de Microbiologia e ImunologiaCampinas SP ,Brazil

关键词: calves;    diarrhea;    E. coli;    virulence factors;    bezerros;    diarréia;    E. coli;    fatores de virulência;   

DOI  :  10.1590/S1517-83822003000300009

来源: SciELO

【 摘 要 】

Two hundred and five Escherichia coli strains isolated from calves with diarrhea from mid-western Brazil were screened for the presence of virulence factors associated with bovine colibacillosis. One hundred and two (49.8%) of the E. coli strains produced toxins: Shiga toxins 1 (9.7%) and 2 (6.3%), a-hemolysin (9.7%), enterohemolysin(6.8%), Cytotoxic Necrotizing Factors type 1 (0.5%), and type 2 (4.4%), enterotoxins LT-II (8.3%) and STa (3.9%). No strain produced enterotoxin LT-I. Fimbrial adhesins F5 and F17 were produced by 7.3% and 4.8% of the strains, respectivly, and none expressed F41. Seven strains (3.4%) possessed the gene eae and belonged to serotypes O26:H-; O111:H- and O118:H16. These results suggest that calves in Brazil may be an important source of pathogenic E. coli for animals and humans.

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