The suspected Delta variant is accounting for 97 percent of all positive coronavirus samples in the Czech Republic, the National Institute of Public Health (SZÚ) said in a press release. In the past week, 1,787 persons were examined with the PCR discrimination method. The occurrence of the new variant can only with certainty be confirmed by genome sequencing. This year, 6,155 samples have been sequenced, 349 of which last week alone. The new, more contagious variants of coronavirus are gradually replacing the less infectious ones. Since June, the Delta variant, aka Indian, started spreading in the Czech Republic in June. Experts have detected its further subtypes. In about 20 cases in the Czech Republic, the definitive confirmation of the Delta plus is still being expected. Roughly 10 percent of the positive samples are sent for the genome sequencing.