Abstract
The COVID-19 pandemic disrupted progress towards global HCV elimination goals by interrupting essential health services in Canada and globally. We aimed to evaluate the effect of the pandemic on hepatitis C virus (HCV) testing rates in a population-based cohort study in Ontario using health administrative data. All residents with records of either HCV antibody or ribonucleic acid (RNA) tests were included. Monthly testing rate per 1000 population were compared during the pre-pandemic (01/01/2015-29/02/2020) and pandemic (01/03/2020-31/12/2022) periods using interrupted time series models, stratified by sex, homelessness, human immunodeficiency virus (HIV), and immigration status, and people who inject drugs (PWID). The HCV testing rate followed a statistically significant upward trend before the pandemic, dropping at its onset with 1.38/1000 fewer individuals initiating testing monthly. Compared to counterfactual estimates, the observed monthly number of people tested per 1000 population was lower by 1.41 (95% CI: 1.18-1.64) in 2020 (May-Dec), 1.17 (95% CI: 0.99-1.36) in 2021, and 1.41 (95% CI: 1.22-1.59) in 2022, corresponding to relative reductions of 47%, 34%, and 41%, respectively. Testing rates remained below expected levels across all subgroups throughout 2020-2022, with the greatest absolute declines observed among people co-infected with HIV, people experiencing homelessness, and PWID. Tailored, equity-focused interventions are needed to address these persistent gaps in HCV testing, without which Canada's progress toward its 2030 elimination targets remains at risk.