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Cumulative standardised incidence (No./100,000/day) of SARS-CoV-2 positive cases among workers receiving the full vaccination (infection detected ≥7 days after the second shot), workers receiving half vaccination (infection detected between 14 and 27 days after the first shot) and not vaccinated workers, between January 25th and April 13th 2021. Total number of workers which had received the full schedule is reported on the horizontal axis along with its percentage.
