Table 1. Cohort characteristics.

Summary of demographic and clinical characteristics of study participants. P-values represent comparison of characteristics between participants with Delta versus Omicron variant infections from chi-squared exact tests for categorical variables and rank-sum non-parametric testing for continuous variables.

	Delta variant infection (n=19)	Omicron variant infection (n=31)	P-value
Female, n (%)	14 (75%)	21 (67%)	0.75
Age, median (IQR)	41 (35–55)	44 (30–57)	0.75
Vaccination status, n (%)
Unvaccinated	4 (21%)	7 (24%)	0.19
Vaccinated	13 (68%)	14 (45%)
Boosted	2 (11%)	10 (32%)
Days since last vaccination, median (IQR)	234 (65–255)	130 (50–251)	0.43
Symptomatic infection, n (%)	18 (95%)	31 (100%)	>0.99

IQR: Interquartile range