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    Home > Active Ingredient News > Infection > Nat Med: How does Wanzhou, China, effectively control the spread of SARS-CoV-2 virus?

    Nat Med: How does Wanzhou, China, effectively control the spread of SARS-CoV-2 virus?

    • Last Update: 2020-12-11
    • Source: Internet
    • Author: User
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    Wanzhou is a city of 1.74 million people in Chongqing, China, bordering the western part of Hubei province.
    as a gateway from Hubei Province to southwest China, Wanzhou was rapidly affected by the COVID-19 outbreak, with the epicenter being Wuhan.
    20,000 people returned to Wanzhou from Hubei province during the Spring Festival holiday in late January 2020.
    with the blockade of Wuhan and surrounding areas on January 23, 2020, Wanzhou has also become a closed environment for epidemiological investigations.
    these conditions provide an opportunity to better understand the transmission dynamics and risk factors of COVID-19's pathogenic bacteria, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)1.
    about 47 cities in China's 22 provinces have populations similar in size to Wanzhou (1.5 million to 2.5 million) and have adopted the same containment measures to respond to the COVID-19 outbreak.
    , Wanzhou's population is comparable to that of large and medium-sized cities in Europe and the United States.
    these characteristics make Wanzhou an appropriate example for researchers and policymakers in countries and cities severely affected by the COVID-19 outbreak to better understand the transmission dynamics and risk factors of SARS-CoV-2 infection and the effectiveness of control measures.
    , researchers recently sent a paper at Nature Medicine to assess the effectiveness of the 2019 Coronavirus Disease (COVID-19) control measures in Wanzhou, China.
    epidemiological data of 183 confirmed cases of COVID-19 and their close contacts transmitted over five generations during the COVID-19 outbreak in the whole state were analyzed, all of which were severe acute respiratory syndrome coronavirus type 2.
    asymptomatic and asymptomatic cases accounted for about 67.2 per cent and 32.8 per cent, respectively.
    asymptomatic and pre-symptomatic transmission accounted for 75.9 per cent of the total recorded transmission.
    the number of reproductions transmitted by G1-G2 was 1.64 (95% confidence interval: 1.16-2.40), and with the implementation of strict control measures, the number of reproductions in the next generations dropped to 0.31-0.39.
    exposure, frequent exposure and exposure time within 5 d of an infected person is significantly ≥ risk of infection of 8 h.
    the spread of COVID-19 in Wanzhou has been effectively controlled through social evacuation, extensive contact tracing, large-scale testing and strict close contact isolation.
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