Abstract
In an investigation of a listeriosis outbreak in Ontario, Canada, during November 2015–June 2016, pasteurized chocolate milk was identified as the source. Because listeriosis outbreaks associated with pasteurized milk are rare in North America, these findings highlight that dairy products can be contaminated after pasteurization.
Highlights
In an investigation of a listeriosis outbreak in Ontario, Canada, during November 2015–June 2016, pasteurized chocolate milk was identified as the source
A study in the United States reviewed 83 fluid milk– associated disease outbreaks during 1990–2006; only 1 outbreak was attributed to L. monocytogenes [5]
We report an outbreak of listeriosis associated with pasteurized chocolate milk in Ontario, Canada
Summary
A second wave began in April 2016 in which 10 of 17 case-patients reported consuming coleslaw. Milk was not originally pursued as a source This new positive isolate led to reinterviewing of case-patients from the second wave and resulted in 9 (75%) of 12 case-patients reporting consuming brand B when asked about chocolate milk. On June 3, a retail sample of brand B chocolate milk produced at facility C was confirmed positive for L. monocytogenes. This finding led to a class I recall of 1 lot of brand B chocolate milk. Environmental sampling at the manufacturer confirmed the presence of the outbreak strain within a postpasteurization pump dedicated to chocolate milk and on nonfood contact surfaces. Chocolate milk production was resumed after rigorous testing for L. monocytogenes under regulatory oversight
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