Mass screening for SARS-CoV-2 after lockdown in Wuhan, China. Impressive!
The COVID-19 epidemic began in Wuhan, the capital of China’s Hubei province. The first cases of pneumonia of unknown origin were diagnosed in December 2019 (data on the first 27 cases were published on 12-12-2019). By 10-1-2020, Chinese scientists identified the pathogen, determined its complete genomic sequence, and made it publicly available.
The incidence of COVID-19 in Hubei province, and especially in Wuhan in January 2020. grew like an avalanche. On 23-1-2020, a strict quarantine (“lockdown”) would have been introduced in Wuhan, which was valid until 8-4-2020.
During this time, the epidemic in Wuhan was almost completely eliminated – no new cases were detected in the last 2 weeks of lockdown. In the period from 8-4-2020 to 10-5-2020, 6 new cases of COVID-19 were detected in Wuhan. This is very, very small considering that Wuhan has a population of about 11 million. However, to be on the safe side, a program of mass testing of residents for SARS-CoV-2 infection was launched in Wuhan. During 19 days (from 14.5.20 to 1.6.20), 9,899,828 people were tested (92.9% of Wuhan’s population aged 6 years and older). For this, the same PCR test system was used, based on the simultaneous amplification of two fragments of the SARS-CoV-2 RNA genome, and the same rules for interpreting the results.
Most of the samples were tested within the first 24 hours after sampling. Samples that could not be tested on the first day were stored frozen at -70 degrees Celsius. 23% of the samples were tested initially as mixtures (equal volumes of 5 samples) and re-individually tested for “participants” in the mixtures who tested positive. 77% of the samples were tested individually.Поділитися цим: