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«The surge in infections is due to these new variants: Omicron-4 and Omicro-5 more contagious. In spite of what one might expect in a summer period – when cold viruses are usually not very present – they have characteristics that allow them to be transmitted easily », explains Giancarlo Icardi, epidemiologist, director of the Department of Hygiene of the San Martino Polyclinic.