Table 3.

Risk Factors for SARS-CoV-2 Reinfection

Variable	Pre-Omicron	Omicron
People per room	0.59 (0.13–2.60)	0.99 (0.49–1.97)
Chronic rhinitis	2.93 (1.01–8.64)	1.06 (0.55–2.08)
Health care worker	2.58 (0.95–7.13)	0.70 (0.37–1.33)
Vaccination status: unvaccinated or partially vaccinateda	17.81 (5.72–56.91)	0.49 (0.17–1.44)

The model incorporated participant age and family and individual random effects to account for dependence among observations. The data indicate the relative risk of reinfection associated with each variable (+/- 95% credible interval). Variables in bold were associated with a significant increase in the risk of reinfection.

^aFully vaccinated or booster were aggregated and used as baseline in both pre-Omicron and Omicron models.