Yes, they can. In December 2021, Statens Serum Institut tested the rapid antigen tests/’kviktests’ used in Denmark in order to review how safe the individual tests are. Copenhagen Medical uses rapid antigen tests (‘kviktests’) from SD Biosensor. The SSI review of the antigen tests showed that the rapid antigen test used by Copenhagen Medical can detect both the Omicron and Delta variants on a level comparable to the Wuhan variant.