biostudies-literatureUnknown47(1)Altermatt A<h4>Objective</h4>To estimate the proportion of Victorians infected with COVID-19 in January 2022.<h4>Methods</h4>Between 11-19 February 2022 we conducted a nested cross-sectional survey on experiences of COVID-19 testing, symptoms, test outcome and barriers to testing during January 2022 in Victoria, Australia. Respondents were participants of the Optimise Study, a prospective cohort of adults considered at increased risk of COVID-19 or the unintended consequences of COVID-19-related interventions.<h4>Results</h4>Of the 577 participants, 78 (14%) reported testing positive to COVID-19, 240 (42%) did not test in January 2022 and 91 of those who did not test (38%) reported COVID-19-like symptoms. Using two different definitions of symptoms, we calculated symptomatic (27% and 39%) and asymptoAustralian and New Zealand journal of public health100007https://www.ebi.ac.uk/biostudies/studies/S-EPMC9874236biostudies-literatureEstimating the proportion of Victorians infected with COVID-19 during the Omicron BA.1 epidemic wave of January 2022 in Australia.PMC9874236Altermatt AGibney KBLee Wilkinson AHeath KSaich FScott NSacks-Davis RYoung KStoove MHellard MfalseEstimating the proportion of Victorians infected with COVID-19 during the Omicron BA.1 epidemic wave of January 2022 in Australia.<h4>Objective</h4>To estimate the proportion of Victorians infected with COVID-19 in January 2022.<h4>Methods</h4>Between 11-19 February 2022 we conducted a nested cross-sectional survey on experiences of COVID-19 testing, symptoms, test outcome and barriers to testing during January 2022 in Victoria, Australia. Respondents were participants of the Optimise Study, a prospective cohort of adults considered at increased risk of COVID-19 or the unintended consequences of COVID-19-related interventions.<h4>Results</h4>Of the 577 participants, 78 (14%) reported testing positive to COVID-19, 240 (42%) did not test in January 2022 and 91 of those who did not test (38%) reported COVID-19-like symptoms. Using two different definitions of symptoms, we calculated symptomatic (27% and 39%) and asympto2023-01-01T00:00:00Z2023 Jan2025-04-19T13:33:14.721Z2025-02-18T23:37:05.93ZS-EPMC98742363670655210.1016/j.anzjph.2022.100007