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Effective control of SARS-CoV-2 transmission in Wanzhou, China #MMPMID33257893
Shi Q; Hu Y; Peng B; Tang XJ; Wang W; Su K; Luo C; Wu B; Zhang F; Zhang Y; Anderson B; Zhong XN; Qiu JF; Yang CY; Huang AL
Nat Med 2021[Jan]; 27 (1): 86-93 PMID33257893show ga
The effectiveness of control measures to contain coronavirus disease 2019 (COVID-19) in Wanzhou, China was assessed. Epidemiological data were analyzed for 183 confirmed COVID-19 cases and their close contacts from five generations of transmission of severe acute respiratory syndrome coronavirus 2 throughout the entire COVID-19 outbreak in Wanzhou. Approximately 67.2% and 32.8% of cases were symptomatic and asymptomatic, respectively. Asymptomatic and presymptomatic transmission accounted for 75.9% of the total recorded transmission. The reproductive number was 1.64 (95% confidence interval: 1.16-2.40) for G1-to-G2 transmission, decreasing to 0.31-0.39 in later generations, concomitant with implementation of rigorous control measures. Substantially higher infection risk was associated with contact within 5 d after the infectors had been infected, frequent contact and >/=8 h of contact duration. The spread of COVID-19 was effectively controlled in Wanzhou by breaking the transmission chain through social distancing, extensive contact tracing, mass testing and strict quarantine of close contacts.
Nat+Med 2021 ; 27 (1): 86-93
