“In Italy on January 3 the Omicron variant of Covid was predominant, with an estimated prevalence of 81%, with regional variability between 33% and 100%”. These are the definitive results of the rapid survey conducted by the Higher Institute of Health and the Ministry of Health together with the regional laboratories and the Bruno Kessler Foundation. “While the Delta was 19% of the sample tested,” they add. Read also For the investigation – explains a note Iss – the laboratories of the Regions and Autonomous Provinces were asked to select subsamples of positive cases and to sequence the genome of the virus. The sample requested was chosen by the Regions and Autonomous Provinces at random from among the positive samples, guaranteeing a certain geographical representation and, if possible, for different age groups. In total, all the Regions and Autonomous Provinces and a total of 120 regional laboratories and the Military Health Laboratory participated in the survey and 2,632 samples were sequenced.