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. 2024 Jun 28;50(6):223-232.
doi: 10.14745/ccdr.v50i06a05.

Characteristics associated with SARS-CoV-2 testing, infection and vaccine uptake among essential non-healthcare workers in Montréal, 2021

Chelsea Caya  1   2 , Dick Menzies  3   4   5 , Jesse Papenburg  1   2   6   7 , Cedric Yansouni  1   2   7   8 , Jonathon Campbell  3   4   9
Affiliations

Characteristics associated with SARS-CoV-2 testing, infection and vaccine uptake among essential non-healthcare workers in Montréal, 2021

Chelsea Caya et al. Can Commun Dis Rep. .

Abstract

Background: Essential non-healthcare workers experienced higher rates of SARS-CoV-2 infection compared to non-essential workers.

Objective: Identify characteristics associated with SARS-CoV-2 testing, infection and vaccine uptake among essential non-healthcare workers in Montréal, Québec.

Methods: Secondary, cross-sectional analysis of data collected from participants prospectively recruited in two observational studies (first study, Onsite Testing Study, January-March 2021; second study, Self-Testing Study, July-October 2021) of essential non-healthcare workers in 2021. Logistic regression with generalized linear mixed models was used to explore characteristics associated with our outcomes (previous SARS-CoV-2 testing, exposure and vaccination).

Results: Overall, 2,755 participants were included (first study, Onsite Testing Study, n=2,128; and second study, Self-Testing Study, n=627). A higher proportion of participants identified as male (n=1,601; 58%), non-White (n=1,527; 55%) and worked in the manufacturing/supplier sector (n=1,706; 62%). Relative to the first study, Onsite Testing Study, participants in the second study, Self-Testing Study, had higher odds (78% vs. 46%; aOR 4.1, 95% CI: 3.2-5.2) of previous SARS-CoV-2 testing and of testing positive prior to study enrolment (6.2% vs. 4.3%; aOR 1.7, 95% CI: 1.1-2.6). Individuals reporting recent SARS-CoV-2 exposure had higher odds of previous SARS-CoV-2 testing (aOR 4.0, 95% CI: 3.0-5.4), while older age (aOR 0.98, 95% CI: 0.98-0.99 per one-year increase) and being male (aOR 0.6, 95% CI: 0.5-0.7) were associated with lower odds of previous testing. Results were similar in stratified analyses. Participants from businesses with more than 50 employees had higher odds of having received a SARS-CoV-2 vaccine (91% vs. 80%; aOR 2.6, 95% CI: 1.4-4.8).

Conclusion: Consideration of individual and business characteristics associated with testing and vaccination programs for SARS-CoV-2 could improve equity, uptake and impact.

Keywords: SARS-CoV-2; infectious disease; public health; vaccination.

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Conflict of interest statement

Competing interests JP has received grants from AbbVie and MedImmune; personal fees from AstraZeneca and grants and personal fees from Merck; and has served as an advisor to the Canadian Federal COVID-19 Immunity Task Force, unrelated to and outside of the submitted work. CPY has provided consulting services to and sat on independent data monitoring committees for Medicago; and has served as scientific advisor for the Canadian Federal COVID-19 Immunity Task Force, unrelated to and outside the submitted work. JRC has provided SARS-CoV-2 consulting services to the Canadian Federal COVID-19 Immunity Task Force and the World Bank, unrelated to and outside the submitted work. The other authors (CC and DM) report no competing interests.

Figures

Figure 1
Figure 1
Number of participants enrolled in original studies that were ultimately included in the present analysis (n=2,755)
See this image and copyright information in PMC

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