Study from Wuhan finds no evidence Asymptomatic Cases are infectious.


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  • #64476 Reply
    Jim

    “I wanted to share this study, that was published in Nature in November 2020, which shows

    “there was no evidence that the identified asymptomatic positive cases were infectious.”

    It was a study of 10 million residents which found around 300 asymptomatic persons, none of which went on to infect other people.

    “All asymptomatic positive cases, repositive cases and their close contacts were isolated for at least 2 weeks until the results of nucleic acid testing were negative. None of detected positive cases or their close contacts became symptomatic or newly confirmed with COVID-19 during the isolation period.”

    and “A total of 1174 close contacts of the asymptomatic positive cases were traced, and they all tested negative for the COVID-19”

    https://www.nature.com/articles/s41467-020-19802-w

    Seems the west has chosen to forget this vital study and continue to implement more lockdowns which are destroying society and peoples mental health.

    Jim

    #64478 Reply
    Clark

    Well it’s spreading somehow, and faster than ever, and social restrictions (“lockdowns”) clearly slow it down or stop it, Wuhan being a prime example. See also the effect of the UK autumn restrictions on these graphs.

    With vaccines taking time to deploy, and possibly ineffective against some of the new variants, we have no other tool against it.

    Does the study consider presymptomatic cases?

    #64491 Reply
    fwl

    You make an interesting point. I would also like to understand the risks with pre-symptomatic cases. I suspect that its mainly infectious or more so when there are symptoms, but I may be wrong and base my observations off my very limited personal experience.

    Understanding the risk as to pre-symptomatic infection could dramatically change behaviour (provide everyone then complies) and economic impact.

    #64492 Reply
    ET

    It is difficult to reconcile the findings of that study with what is happening in US, UK, Ireland and many other countries in Europe. If you read the whole study you will see where they mention the limitations of it.

    “This study has several limitations that need to be discussed. First, this was a cross-sectional screening programme, and we are unable to assess the changes over time in asymptomatic positive and reoperative results.”

    “Second, although a positive result of nucleic acid testing reveals the existence of the viral RNAs, some false negative results were likely to have occurred,”

    Also they note that “Previous studies have shown that asymptomatic individuals infected with SARS-CoV-2 virus were infectious, and might subsequently become symptomatic………”

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