Figure 2. Rapid Antigen Diagnostic Test Positivity Among 942 People With COVID-19 Who Underwent Repeated Testing During the Omicron BA.1 Period by Day of Symptom Onset (if Symptomatic) or Day Since Initial Positive Test (if Asymptomatic).

COVID-19 status between a participant’s tests was inferred to be positive (if second test was positive) or with a linearly decaying probability of being positive (if second test was negative). A, Results overall, including persons who were symptomatic or asymptomatic, with dotted lines indicating upper and lower bounds of sensitivity analyses. Sensitivity analyses assumed that participants whose second test was negative either became negative immediately after their first test (lower bound) or remained positive until the day before their second test (upper bound). B, Results stratified by symptom status. C, Results stratified by self-reported vaccination status as of the first rapid antigen test. Shaded areas indicate 95% CIs.