| Title | Global Percentage of Asymptomatic SARS-CoV-2 Infections Among the Tested Population and Individuals With Confirmed COVID-19 Diagnosis A Systematic Review and Meta-analysis |
| Authors | Ma, Qiuyue Liu, Jue Liu, Qiao Kang, Liangyu Liu, Runqing Jing, Wenzhan Wu, Yu Liu, Min |
| Affiliation | Peking Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, 38 Xueyuan Rd, Beijing 100191, Peoples R China Peking Univ, Sch Hlth Human, Beijing, Peoples R China |
| Keywords | CORONAVIRUS DISEASE 2019 HEALTH-CARE WORKERS PRESYMPTOMATIC TRANSMISSION HOSPITALIZED-PATIENTS SYMPTOMATIC COVID-19 ORTHOPEDIC-SURGERY PREGNANT-WOMEN CLOSE CONTACTS OUTBREAK OUTCOMES |
| Issue Date | 14-Dec-2021 |
| Publisher | JAMA NETWORK OPEN |
| Abstract | IMPORTANCE Asymptomatic infections are potential sources of transmission for COVID-19. OBJECTIVE To evaluate the percentage of asymptomatic infections among individuals undergoing testing (tested population) and those with confirmed COVID-19 (confirmed population). DATA SOURCES PubMed, EMBASE, and ScienceDirect were searched on February 4, 2021. STUDY SELECTION Cross-sectional studies, cohort studies, case series studies, and case series on transmission reporting the number of asymptomatic infections among the tested and confirmed COVID-19 populations that were published in Chinese or English were included. DATA EXTRACTION AND SYNTHESIS This meta-analysis was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline. Random-effects models were used to estimate the pooled percentage and its 95% CI. Three researchers performed the data extraction independently. MAIN OUTCOMES AND MEASURES The percentage of asymptomatic infections among the tested and confirmed populations. RESULTS Ninety-five unique eligible studies were included, covering 29 776 306 individuals undergoing testing. The pooled percentage of asymptomatic infections among the tested population was 0.25%(95% CI, 0.23%-0.27%), which was higher in nursing home residents or staff (4.52% [95% CI, 4.15%-4.89%]), air or cruise travelers (2.02%[95% CI, 1.66%-2.38%]), and pregnant women (2.34%[95% CI, 1.89%-2.78%]). The pooled percentage of asymptomatic infections among the confirmed population was 40.50% (95% CI, 33.50%-47.50%), which was higher in pregnant women (54.11% [95% CI, 39.16%-69.05%]), air or cruise travelers (52.91%[95% CI, 36.08%-69.73%]), and nursing home residents or staff (47.53%[95% CI, 36.36%-58.70%]). CONCLUSIONS AND RELEVANCE In this meta-analysis of the percentage of asymptomatic SARS-CoV-2 infections among populations tested for and with confirmed COVID-19, the pooled percentage of asymptomatic infections was 0.25% among the tested population and 40.50% among the confirmed population. The high percentage of asymptomatic infections highlights the potential transmission risk of asymptomatic infections in communities. |
| URI | http://hdl.handle.net/20.500.11897/632775 |
| ISSN | 2574-3805 |
| DOI | 10.1001/jamanetworkopen.2021.37257 |
| Indexed | SCI(E) |
| Appears in Collections: | 公共卫生学院 |
