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Antibody tests also show people immune
About three milliliters of blood were drawn each time the sample was drawn and then tested for antibodies to SARS-CoV-2. People have also been found who are believed to be immune to the coronavirus, either because they got over the disease or because they didn’t get sick at all.
To prevent scammers from using the current study to attack the population, the staff of the cohort study are always accompanied by the police.
Only those who were randomly selected by the computer for the study could participate. So only when the researchers rang the doorbell did the residents have a choice. This was important so that generally applicable claims could later be derived from the study.
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