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Coronavirus Disease 2019 (COVID-19) was first reported in December 2019 and was declared a pandemic by the World Health Organization on 11 March 2020.
the implementation of strict blockade measures, China's COVID-19 outbreak was generally under control, the country entered the post-blockade phase.
At this stage, countries face new problems and challenges, including how to accurately assess the risks of the COVID-19 outbreak after the blockade, how to avoid a new wave of COVID-19 outbreaks, and how to promote economic and normal social recovery.
, China's most affected city by COVID-19, has been under lockdown since January 23, 2020 and April 8, 2020.
the first two months after the city reopened, there were only a few sporadic cases of COVID-19 in Wuhan (six new confirmed cases from April 8 to May 10, 2020).
the risk of COVID-19 in Wuhan is still worrying, seriously affecting the recovery of industrial production and social services, hindering the normal life of residents.
in order to find out the current situation of COVID-19 epidemic, Wuhan municipal government carried out a comprehensive city-wide screening of SARS-CoV-2 nucleic acid infection from May 14, 2020 to June 1, 2020.
SARS-CoV-2 infection screening in Wuhan is a large-scale screening program in the post-blockade environment, providing valuable experiences or lessons of international significance as more and more countries and cities around the world enter the post-blockade phase.
researchers also published an article in the journal Nature Communications, reporting on the organization of the city's nucleic acid screening, the detailed technical methods used and the results.
all urban residents over 6 years of age were eligible for screening, with a total of 989,9828 (92.9%) participating.
screening found no new symptomatic cases and 300 asymptomatic cases (detection rate 0.303/10000, 95% CI: 0.270-0.339/10000).
, no positive cases were detected in the 1,174 close contacts of asymptomatic cases.
107 of the 34,424 previously recovered COVID-19 patients tested positive again (re-positive rate 0.31%, 95% CI 0.423-0.574%).
, the SARS-CoV-2 infection rate in Wuhan was very low five to eight weeks after the blockade ended.
