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In nearly 90 percent of corona cases, the site of infection is unknown, as an internal federal administration document shows.
Contact tracing has been a difficult business for months, and all too often the search for leads is unsuccessful. Now it becomes clear that the difficulties are much greater than previously assumed. In 87 percent of cases, the subjective site of infection is unknown. This stems from an internal document of the federal administration, which is available to SonntagsZeitung.
The document is an analysis of contact tracing, which is based on data from the Federal Office of Public Health (BAG). More than 100,000 corona infections were evaluated in the period from January 2020 to the end of January 2021 in six cantons: Aargau, Basel-Land, Basel-Stadt, Freiburg, Graubünden and Neuchâtel.