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Measures to control SARS-CoV-2 often include the regular disinfection of public surfaces. The frequency of SARS-CoV-2 detection on surfaces in the surrounding of confirmed cases was evaluated in this systematic review. Overall, 26 studies showed 0 and 100% rates of contamination with SARS-CoV-2 RNA on surfaces in the surrounding of patients. Seven studies with at least 100 samples mostly showed detection rates between 1.4 and 19%. Two other studies did not detect infectious SARS-CoV-2 on any surface. Similar results were obtained from surfaces in the surrounding of confirmed SARS- and influenza-patients. A contamination of public surfaces with infectious virus is considerably less likely because there are much less potential viral spreaders around a surface, the contact time between a person and the surface is much shorter, and the asymptomatic carriers typically have no symptoms. In addition, a hand contact with a contaminated surface transfers only a small part of the viral load. A simple cleaning reduces the number of infectious viruses already by 2 log 10 -steps. That is why public surfaces should in general be cleaned because the wide use of biocidal agents for surface disinfection further increases the microbial selection pressure without an expectable health benefit.

Ist die Desinfektion öffentlicher Flächen zur Prävention von SARS-CoV-2 – infektionen sinnvoll?