"Table 1: Rate of reinfections per 100,000 participant days at risk"
"Estimated rate of COVID-19 reinfections per 100,000 participant days at risk, averaged for entire at-risk period, 26 April 2020 to 14 August 2021, UK"
Definition ,"Number of
participants
at risk","Number of
identified
reinfections","Estimated rate
of reinfections
(per 100,000
participant
days at risk)","Lower 95%
confidence
interval","Upper 95%
confidence
interval"
"All reinfections
definition","19,467",191,10.9,9.4,12.5
"Reinfections with
Ct less than 30","19,467",72,4.1,3.2,5.2
Source: ,Office for National Statistics – Coronavirus (COVID-19) Infection Survey
Notes
1,For the purposes of this analysis we define reinfection as a new positive test 120 days or more after an initial first positive test which was preceded by at least one negative test or where an individual has had a subsequent positive test following four consecutive negative tests regardless of the time since the first positive.
2,"A confidence interval gives an indication of the degree of uncertainty of an estimate, showing the precision of a sample estimate. A wider interval indicates more uncertainty in the estimate. "