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. 2023 Mar;20(3):81-89.
doi: 10.1089/fpd.2022.0064.

Impact of the COVID-19 Pandemic on the Reported Incidence of Select Bacterial Enteric Diseases in Canada, 2020

Brendan Dougherty  1 , Russell O Forrest  2 , Courtney R Smith  2 , Vanessa Morton  2 , Lauren M Sherk  1 , Brent Avery  1 , Ashley Kearney  3 , Sara Christianson  3 , Celine Nadon  3 , M Kate Thomas  1
Affiliations

Impact of the COVID-19 Pandemic on the Reported Incidence of Select Bacterial Enteric Diseases in Canada, 2020

Brendan Dougherty et al. Foodborne Pathog Dis. 2023 Mar.

Abstract

The aim of this study was to describe the impact of the COVID-19 pandemic on reported cases and clusters of select enteric diseases in Canada, for the period of March 2020 to December 2020. Weekly counts of laboratory confirmed cases of Salmonella, Shigella, Shiga toxin-producing Escherichia coli (STEC), and Listeria monocytogenes were obtained from laboratory surveillance data. These data were supplemented with epidemiological information on the suspected source of illness, collected for cases identified within whole genome sequencing clusters. Incidence rate ratios were calculated for each pathogen. All data were compared with a prepandemic reference period. Decreases in the number of reported cases in 2020 compared with the previous 5-year period were noted for Salmonella, Shigella, Escherichia coli O157, and non-O157 STEC. Reported number of cases for L. monocytogenes in 2020 remained similar to those of the previous 5-year period. There was a considerable decline (59.9%) in the number of cases associated with international travel compared with a 10% decline in the number of domestic cases. Comparison of reported incidence rates of clustered versus sporadic cases for each pathogen showed little variation. This study represents the first formal assessment of the impact of COVID-19 on reported enteric diseases in Canada. Reported case counts across several pathogens saw notable declines in 2020 compared with prepandemic levels, with restrictions on international travel playing a key role. Additional research is needed to understand how limitations on social gatherings, lock downs, and other public health measures have impacted enteric diseases.

Keywords: COVID-19; foodborne illness; trends.

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Conflict of interest statement

No competing financial interests exist.

Figures

FIG. 1.
FIG. 1.
Comparison of weekly case counts for 2020 and the average weekly case counts for 2015–2019 for Escherichia coli O157, non-O157 STEC, Shigella, Salmonella, and Listeria, overlaid with the Canadian National Stringency Index for 2020. STEC, Shiga toxin–producing Escherichia coli.
FIG. 2.
FIG. 2.
Number of human cases added to a multi-jurisdictional WGS cluster associated with international travel (A) and not associated with travel (domestic) (B) in 2020, compared to a two-year average (2018-2019).
FIG. 3.
FIG. 3.
Incidence rate ratios comparing the rates between 2020 and referent periods for each pathogen.
See this image and copyright information in PMC

References

    1. Armistead I, Tran A, White AE, et al. . Trends in outpatient medical-care seeking for acute gastroenteritis during the COVID-19 pandemic, 2020. Foodborne Pathog Dis 2022;19:290–292. - PubMed
    1. Bassal R, Keinan-Boker L, Cohen D. A significant decrease in the incidence of Shigellosis in Israel during COVID-19 pandemic. IJERPH 2021;18:3070. - PMC - PubMed
    1. Bender KE, Badiger A, Roe BE, et al. . Consumer behavior during the COVID-19 pandemic: An analysis of food purchasing and management behaviors in US households through the lens of food system resilience. Socio-Econ Plan Sci 2022;82:101107. - PMC - PubMed
    1. Butler AJ, Thomas MK, Pintar KD. Expert elicitation as a means to attribute 28 enteric pathogens to foodborne, waterborne, animal contact, and person-to-person transmission routes in Canada. Foodborne Pathog Dis 2015;12:335–344. - PubMed
    1. Carroll N, Sadowski A, Laila A, et al. . The impact of COVID-19 on health behavior, stress, financial and food security among middle to high income Canadian families with young children. Nutrients 2020;12:2352. - PMC - PubMed

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