Covid Italia, Iss: “On April 4 Omicron was 100% with Omicron 2 at 86.6%”

100% Omicron variant, with Omicron 2 predominant at almost 87% (but with peaks of 100%) and the appearance – currently below 1%, but with peaks up to almost 21% – of two recombinants of Omicron 1 and 2, XJ and XL. This is the photograph of Covid in Italy on April 4, taken by the flash survey conducted by the Higher Institute of Health and the Ministry of Health, together with the regional laboratories and the Bruno Kessler Foundation. In detail, these are the estimated prevalences: BA.1 11.8% (range 0-34.5%); BA.2 86.6% (range 46.5-100%); BA.3 0.2% (range 0-1.2%); XJ 0.5% (range 0-11.6%); XL 0.9% (range: 0-20.9%). For the investigation – recalls the ISS – the laboratories of 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 / Pa at random from among the positive samples, ensuring a certain geographical representativeness and, if possible, for different age groups. All Regions / Pa took part in the survey, for a total of 115 laboratories that sequenced 2,018 samples.