Analysis on infection risk in secondary close contacts of COVID-19 patients.
- Author:
Bo YI
1
;
Yan Ru CHU
1
;
Yi CHEN
1
;
Dong Liang ZHANG
1
;
Yan Wu ZHANG
1
;
Song LEI
1
;
Lu HONG
2
;
Qiao Fang LI
3
;
Xiao Min GU
1
;
Xu Ying LAO
1
;
Hai Bo WANG
1
;
Jun Fen LIN
4
;
Guozhang XU
1
Author Information
- Publication Type:Journal Article
- MeSH: COVID-19/epidemiology*; Contact Tracing; Humans; Incidence; Nucleic Acids; Prospective Studies; SARS-CoV-2
- From: Chinese Journal of Epidemiology 2022;43(8):1237-1240
- CountryChina
- Language:Chinese
- Abstract: Objective: To study the infection rate of secondary close contacts of COVID-19 patients, and assess the infection risk in the contacts. Methods: COVID-19 patients' close contacts (with a clear exposure time to index case) with negative nucleic acid test results and secondary close contacts were surveyed in continuous isolation and medical observation in this prospective study. The dynamic nucleic acid test results of the close contacts and secondary contacts of COVID-19 patients were collected to assess their risk of infection. Results: A total of 4 533 close contacts were surveyed, in whom 14 were confirmed as COVID-19 patients with overall secondary attack rate of 0.31%, and 4 201 secondary contacts were tracked, in whom no subsequent infections occurred. Conclusion: Close contacts of COVID-19 patients entered in centralized isolation for medical observation with negative nucleic acid tese results,the secondary close contacts of COVID-19 patients have no risk of infection.
