Figure 1:

Provincial surveillance case reports by epidemiological week and timing of serosurveys, British Columbia, Canada, January 2020 (epidemiological week 3) to August 2023 (epidemiological week 32). Weekly surveillance case reports of SARS-CoV-2 infections confirmed by nucleic acid amplification test (NAAT) were reported to the British Columbia Centre for Disease Control (BCCDC) from the Fraser Health Authority (HA) and Vancouver Coastal HA in the Lower Mainland, as well as other provincial HAs (combined).¹⁷ Case tallies are grouped by epidemiological week (7-d period) as per standard surveillance methods for comparing data by period from year to year. Serosurveys exclude those identified as assisted living, independent living or long-term care facility residents but provincial case tallies do not apply those exclusions. Epidemic waves are indicated with the predominant variant of concern (VOC).¹⁶ Changes in publicly funded access to NAATs or rapid antigen tests (RATs) are displayed below the x-axis.⁹