Serologic characterization and typing of the toxins produced by strains of Escherichia coli isolated from swines with diarrhoea in the state of São Paulo
Keywords:Swine diarrhoea, Escherichia coli, Enterotoxins
Faecal samples were collectcd from 85 piglets with diarrhoea in five pig farms located in the Municipalities of Bragança Paulista and Guarulhos in the State of São Paulo, Brazil. The presence of thermostable entcrotoxin (STa), was achieved by the new-born mouse test; whereas for the (STb) type, it was used the test in tied loops of pig bowel. Among the serogroups investigated, the 0149 was found in 19 (22.35%) isolations, having 16 (18.82%) of them producing STa entcrotoxin, and three (3.52%) the STa and STb types. In the serogroup 0139, e ight (9.41%) strains produced STa enterotoxin. The serogroups 010, 0119, 0148 and 0158 produced only the STa enterotoxin. However, the serogroup 020 presented some more features: one (1.17%) sample had STb enterotoxin and two (2.35%) produced, simultaneously, STa and STb. Two (2.35%) STa entcrotoxin positive samples were observed, in the serogroups 035 and 0157.
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