Why it took nearly a year to link multiple Listeria cases to some plant-based milks

The Public Health Agency of Canada says it was only after multiple Listeria cases emerged in Ontario in June that it recognized a broader outbreak that had started back in August 2023.

Questions have swirled around why it took nearly a year for the Canadian Food Inspection Agency to announce a national recall of several Silk and Great Value plant-based milk products on July 8.

The federal agency says it became aware of two genetically related listeriosis cases — the illness caused by Listeria bacteria — in September 2023, but knew of no common food exposure.

PHAC spokesperson Anna Maddison says it was only when several cases in Ontario were reported in June 2024 and a provincial investigation was launched that the connection was made.