Factors associated with onward SARS-CoV-2 transmission among household and dormitory contacts of cases in Brunei Darussalam, August 2021 to February 2022: A retrospective cohort study
Year: 2026
Type: article
Study design: Observational Study
Abstract: Objective We determine the factors associated with contacts testing positive within a typical household and worker dormitory clusters during the COVID-19 Delta and Omicron waves. Methods Retrospective analyses of national COVID-19 cases and contacts datasets in Brunei Darussalam, from August 2021 to mid-February 2022. Results We identified 22,540 laboratory-confirmed cases, whereby 50.9% and 25.9% were from household and dormitory clusters, respectively. The median (IQR) SI for household [3 days (2 – 5)] was shorter than that of dormitory [5 days (3 - 9), p-value < 0.001]. Merging with the contact dataset provided 14,289 household (and 10,900 dormitory) contacts from 2,817 (and 1,071) index cases. The overall SAR was similar for household (31.7% [95% Confidence Interval (95%CI): 31.0, 32.5]) and dormitory contacts (27.4% [95%CI: 26.6, 28.3]). For all contacts, adjusted odds ratios (aORs) increase with decreasing vaccine doses acquired at exposure, and if their index cases were symptomatic and infected during the Omicron period. aORs were higher among older household contacts (>40 years) and immediate family members of their index cases. In contrast, aORs for dormitory contacts were higher among male index cases. Conclusion Our findings suggest a significant role of housing composition in within-household transmission dynamics.
Source: IJID Regions
Language: English
Subfield: Modeling and Simulation
Field: Mathematics
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,380
OpenAlex ID: W7147207016