Global & Disaster Medicine

Ontario, Canada: Listeria monocytogenes Associated with Pasteurized Chocolate Milk

EID

Hanson H, Whitfield Y, Lee C, Badiani T, Minielly C, Fenik J, et al. Listeria monocytogenes Associated with Pasteurized Chocolate Milk, Ontario, Canada. Emerg Infect Dis. 2019;25(3):581-584. https://dx.doi.org/10.3201/eid2503.180742

Outbreak cases of listeriosis (n = 34) by onset week and year, Ontario, Canada, November 2015–August 2016. Data were obtained from the Ontario Ministry of Health and Long-Term Care, integrated Public Health Information System database, extracted by Public Health Ontario, August 16, 2016. One case with an onset date during January 2016 occurred in week 52 of 2015 (according to the Public Health Agency of Canada epidemiologic week calendar). *Neonatal case-patient with symptom onset on April 4, 20

Figure 1. Outbreak cases of listeriosis (n = 34) by onset week and year, Ontario, Canada, November 2015–August 2016. Data were obtained from the Ontario Ministry of Health and Long-Term Care, integrated Public Health Information System database, extracted by Public Health Ontario, August 16, 2016. Weeks are defined according to the Public Health Agency of Canada epidemiologic week calendar. *Neonatal case-patient with symptom onset on April 4, 2016 (week 14), and illness most likely caused by mother-to-child transmission. **Asymptomatic case-patient from whom a specimen was collected on July 13, 2016, and exposure occurred before June 27, 2016 (week 28).

Bags of pasteurized chocolate milk as sold in Canada, with outer bag containing brand information removed. A bag of milk similar to these, found at the home of 1 case-patient during investigation of an outbreak of Listeria monocytogenes infection associated with pasteurized chocolate milk in Ontario, Canada, was found to be contaminated with the same strain obtained from infected patients.

Figure 2. Bags of pasteurized chocolate milk as sold in Canada, with outer bag containing brand information removed. A bag of milk similar to these, found at the home of 1 case-patient during investigation of an outbreak of Listeria monocytogenes infection associated with pasteurized chocolate milk in Ontario, Canada, was found to be contaminated with the same strain obtained from infected patients.

 


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