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Spain: Largest Study To Date Finds Only 5% Of Population Had The Virus As Of Early May
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The medical journal Lancet has published a new study looking at the seroprevalence of the coronavirus in Spain. The study used a large, nationwide sample of more than 61,000 people and gave them two different types of blood tests to determine if they had antibodies to the virus. Using the two tests in combination they came up with a "seroprevalence range," i.e. an estimate of the percentage of the entire population that has already had the virus. As of early May, the average in Spain was about 5 percent, though it varied substantially by region.

...In addition to the study itself, Lancet published a note explaining its significance. ...

    In light of these findings, any proposed approach to achieve herd immunity through natural infection is not only highly unethical, but also unachievable. With a large majority of the population being infection naive, virus circulation can quickly return to early pandemic dimensions in a second wave once measures are lifted.
    As was indeed the case in every place there restrictions were lifted
    In addition, the geographical variability and the dynamic of weekly increasing seroprevalence rates during the early phase of the pandemic highlight that these studies are only snapshots in time and space, and reflect the circumstances of the period in which they were done. As we are still in the midst of an unprecedented global health crisis, such seroprevalence data will continue to be necessary for public health authorities to estimate exposure rates, especially in areas with little testing capacity for acute cases. If and when a vaccine is widely available, ongoing seroprevalence studies will be able to provide information about the extent and duration of vaccine-induced herd immunity.

Posted by: g(r)omgoru 2020-07-07
http://www.rantburg.com/poparticle.php?ID=576322