Global & Disaster Medicine

Ontario, Canada: Listeria monocytogenes associated with pasteurized chocolate milk


“……Thirty-four case-patients met the outbreak definition; only Ontario residents were identified. Eleven case-patients had an onset date during November 14, 2015–February 14, 2016. Onset dates ranged from April 11 to June 20, 2016, for 21 case-patients in the second wave; the remaining 2 case-patients were outliers (Figure 1). Median age was 73 years (range <1 years–90 years). More than half of the case-patients were female (20/34, 59%). Hospitalizations occurred for 32 (94%) case-patients, and 4 deaths (12%) were reported...…”

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 Mar [date cited].

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.

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


Comments are closed.


Recent Posts