RESUMO
In an experimental study on a piggery it was found that haemolytic Escherichia coli of O-serotypes 138 or 139 proliferated in the intestinal tracts of pigs following weaning, with E. coli of the O-138 type also being occasionally recovered from unweaned pigs, and once from a sow. Organisms of the O-138 type produced heat labile enterotoxin and their presence in weaned pigs was associated with the development of severe post-weaning diarrhoea. E. coli of O-139 type produced a vero cell cytotoxin and were associated with a milder diarrhoea in weaned pigs. Under various managemental circumstances the O-138 type E. coli almost invariably proliferated after weaning. The O-139 strain of E. coli did however proliferate rather than the O-138 strain following the movement of weaned pigs to new accommodation, after weaned pigs were returned to their sow and then weaning again 5 days later, and very occasionally in pigs weaned at 5 weeks of age. In all these cases earlier proliferation of the O-138 E. coli had been detected, suggesting that this may be a prerequisite for proliferation of the O-139 strain.
Assuntos
Diarreia/veterinária , Infecções por Escherichia coli/microbiologia , Infecções por Escherichia coli/veterinária , Proteínas de Escherichia coli , Escherichia coli/crescimento & desenvolvimento , Intestinos/microbiologia , Doenças dos Suínos/microbiologia , Animais , Toxinas Bacterianas/biossíntese , Citotoxinas/biossíntese , Diarreia/microbiologia , Enterotoxinas/biossíntese , Escherichia coli/classificação , Escherichia coli/patogenicidade , Sorotipagem , Toxina Shiga I , Suínos/microbiologia , DesmameRESUMO
During an outbreak of food poisoning at a church camp, 16 of the 25 people attending were affected. Despite a thorough search for a bacterial pathogen none was identified. An examination of the Escherichia coli serotypes present suggest that E. coli O159. H9 may have been the organism causing the outbreak.
Assuntos
Surtos de Doenças/epidemiologia , Doenças Transmitidas por Alimentos/epidemiologia , Bactérias/isolamento & purificação , Escherichia coli/patogenicidade , Doenças Transmitidas por Alimentos/etiologia , Humanos , Nova Zelândia , SorotipagemRESUMO
The faeces of nine subjects eating mainly at home were collected at regular intervals over periods ranging from 2--5 months. Although a large number of serotypes of E. coli were isolated, the variety per subject was lower than is usually found. In most subjects only a limited number of serotypes persisted over most of the periods of study while many serotypes were only isolated on single occasions.
