Author: Carroll, C.; Conway, R.; O’Donnell, D.; Norton, C.; Hogan, E.; Browne, M.; Buckley, C. M.; Kavanagh, P.; Martin, J.; Doyle, S.
Title: Routine testing of close contacts of confirmed COVID-19 cases – National COVID-19 Contact Management Programme, Ireland, May to August 2020 Cord-id: mhegmcvf Document date: 2020_10_21
ID: mhegmcvf
Snippet: Objectives To inform public health practitioners who are designing, adapting and implementing testing and tracing strategies for COVID-19 control. Study design Monitoring and evaluation of a national public health protection programme. Methods All close contacts of laboratory confirmed cases of COVID-19 identified between the 19th May and 2nd August were included; secondary attack rates, and numbers needed to test were estimated. Results 4,586 of 7,272 (63%) close contacts of cases were tested w
Document: Objectives To inform public health practitioners who are designing, adapting and implementing testing and tracing strategies for COVID-19 control. Study design Monitoring and evaluation of a national public health protection programme. Methods All close contacts of laboratory confirmed cases of COVID-19 identified between the 19th May and 2nd August were included; secondary attack rates, and numbers needed to test were estimated. Results 4,586 of 7,272 (63%) close contacts of cases were tested with at least one test. The secondary attack rate in close contacts who were tested was 7% (95%CI 6.3 - 7.8%). At the ‘Day 0’ test, 14.6% (95%CI 11.6 – 17.6%) of symptomatic close contacts tested positive compared with 5.2% (95%CI 4.4 – 5.9%) of asymptomatic close contacts. Conclusions The application of additional symptom based criteria for testing in this high incidence population (close contacts) is of limited utility because of the low negative predictive value of absence of symptoms.
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