In May, 2010, at least 43 people were lab-confirmed to be sickened with cyclospora and over 200 displayed symptoms of illness after attending the Chef’s Challenge, a fundraiser for the Big Sisters of Sarnia-Lambton in Ontario, Canada.

"It wasn’t something we were able to go ahead with this year given the incident that took place," said executive director Kathy Alexander.

Local health types figured the source of the cyclospora was a cool pesto crunch but couldn’t identify the ingredient.