Post-lockdown SARS-CoV-2 nucleic acid screening in nearly ten million residents of Wuhan, China

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. 2020 Nov 20;11(1):5917.
 doi: 10.1038/s41467-020-19802-w.
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Stringent COVID-19 control measures were imposed in Wuhan between January 23 and April 8, 2020. Estimates of the prevalence of infection following the release of restrictions could inform post-lockdown pandemic management. Here, we describe a city-wide SARS-CoV-2 nucleic acid screening programme between May 14 and June 1, 2020 in Wuhan. All city residents aged six years or older were eligible and 9,899,828 (92.9%) participated. No new symptomatic cases and 300 asymptomatic cases (detection rate 0.303/10,000, 95% CI 0.270-0.339/10,000) were identified. There were no positive tests amongst 1,174 close contacts of asymptomatic cases. 107 of 34,424 previously recovered COVID-19 patients tested positive again (re-positive rate 0.31%, 95% CI 0.423-0.574%). The prevalence of SARS-CoV-2 infection in Wuhan was therefore very low five to eight weeks after the end of lockdown.

Conflict of interest statement

The authors declare no competing interests.


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Fig. 1. The occupation distribution of asymptomatic…

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Fig. 2. The geographic distribution of the…

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Fig. 3. The prevalence of previously confirmed…

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