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.2022 Aug;113(4):569-578.
doi: 10.17269/s41997-022-00614-y. Epub 2022 Mar 11.

Disease outbreaks linked to pasteurized and unpasteurized dairy products in Canada and the United States: a systematic review

Affiliations

Disease outbreaks linked to pasteurized and unpasteurized dairy products in Canada and the United States: a systematic review

Meghan Sebastianski et al. Can J Public Health.2022 Aug.

Abstract
in English, French

Objective: Pasteurization kills harmful microorganisms found in milk. While consumption of unpasteurized milk and its products is discouraged due to increased risk of infections, some individuals prefer unpasteurized dairy products. Our objective was to estimate the burden of illness from outbreaks arising from consumption of unpasteurized and pasteurized dairy products in Canada and the United States.

Methods: We conducted a systematic review of dairy-associated outbreaks in Canada and the USA from 2007 onward. We searched MEDLINE, Embase, Cochrane Library, TRIP Database for guidelines, and North American government agency websites up to October 2020. We included outbreak reports where the pathogenic microbe was confirmed in both the patient and the dairy product through laboratory testing.

Synthesis: Thirty-two disease outbreaks were linked to dairy consumption. Twenty outbreaks involving unpasteurized products resulted in 449 confirmed cases of illness, 124 hospitalizations, and five deaths. Twelve outbreaks involving pasteurized products resulted in 174 confirmed cases of illness, 134 hospitalizations, 17 deaths, and seven fetal losses. Listeria accounted for 10 out of 12 outbreaks from pasteurized products from 2007 through 2020.

Conclusion: Public warnings about the risk of unpasteurized dairy consumption need to continue and pregnant women and immunocompromised hosts need to be made aware of foods at high risk of contamination with Listeria.

RéSUMé: OBJECTIF: La pasteurisation tue les micro-organismes dangereux contenus dans le lait. Même si la consommation du lait non pasteurisé et ses produits fût déconseillée en raison d’un risque accru d’infection, certaines personnes préfèrent des produits laitiers non pasteurisés. Notre objectif était d’évaluer le fardeau de maladie des éclosions résultant de la consommation des produits laitiers non pasteurisés et pasteurisés au Canada et aux États-Unis. MéTHODE: Nous avons mené une revue systématique des éclosions liées aux produits laitiers au Canada et aux États-Unis depuis 2007. Nous avons cherché dans MEDLINE, Embase, Cochrane Library, TRIP Database et les sites web des agences gouvernementales Nord-Américaines pour la période 2007 jusqu’au mois d’octobre 2020. Nous avons inclus des rapports d’éclosion lorsque les essais en laboratoire ont confirmé la présence du microbe pathogène dans le patient ainsi que dans le produit laitier. RéSULTATS: Trente-deux éclosions étaient liées à la consommation des produits laitiers. Les produits non pasteurisés étaient impliqués dans 20 éclosions, avec 449 cas de maladie confirmés, 124 hospitalisations et 5 morts. Les produits pasteurisés étaient impliqués dans 12 éclosions, avec 174 cas de maladie confirmés, 134 hospitalisations, 17 morts et sept morts fœtales. Listeria comptait pour 10 des 12 éclosions des produits pasteurisés de 2007 à 2020. CONCLUSION: Les avis publics au sujet du risque de la consommation des produits laitiers non pasteurisés devraient continuer et les femmes enceintes et les hôtes immunodéprimés devraient être informés de la nourriture à haut risque de la contamination avec Listeria.

Keywords: Dairy products; Disease outbreak; Listeria; Pasteurization; Raw foods.

© 2022. The Author(s) under exclusive license to The Canadian Public Health Association.

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Conflict of interest statement

The authors declare no competing interests.

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References

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