Health investigators and scientists are diving deep into food and fecal samples to zero in on the cause of an ongoing E. coli outbreak affecting Calgary daycares, but experts say definitive answers may be hard to come by.
“You are trying to find the same organism with the same fingerprint,” said Timothy Sly, an epidemiologist and professor emeritus at Toronto Metropolitan University.
Dr. Mark Joffe, Alberta's chief medical officer of health, has said a central kitchen serving the daycares is almost certainly the source of the infections. Piecing together the puzzle isn't straightforward, he said. Investigators will look to food handlers, those infected and the food itself.Sly said samples will have been collected from people who work in the kitchen and those infected with E. coli.
The bacteria related to this outbreak is Shiga toxin-producing E. coli. Less than 10 cells can make a person sick, Gaenzle said. It also makes it difficult to identify in food because there are a trillion bacterial cells in a gram. On top of that, the food served may have already been thrown out.If there are no good samples from food, Gaenzle said experts will go back to conventional wisdom about E. coli outbreaks.
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