Those returning from the high-risk (red) countries need an antigen or PCR test before departure and another one in five days following their arrival in the Czech Repulbic, during which they must quarantine. As of Monday, these countries will be Austria, Croatia, Denmark, Finland, Germany, Greece, Ireland, Latvia, Lichtenstein, Lithuania, Luxembourg, Malta, Monaco, Norway, Romania, Slovakia, Spain, Switzerland, the Canary Islands, and Madeira.