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Three recently detected variants (B.1.1.7, B.1.351, P.1) of SARS-CoV-2 have been detected in various countries worldwide including Switzerland. We aim at tracking the spread of these variants in the cantons of Geneva, Bern, and Zurich, and in Switzerland overall. As a comparison, we also provide an analysis of the spread of B.1.1.7 in Denmark. Finally, we estimate the current proportion of the variants for a given region and their increased transmissibility.