Covid today in Italy, Rt and weekly incidence decreasing nationwide. According to the main data of the control room monitoring, released by the Higher Institute of Health (Iss), it amounts to 675 cases per 100 thousand inhabitants (in the period 15-21 April), compared to 717 / 100,000 in the previous week (8-14 April). As regards the transmission index Rt for Covid-19: in the period from March 23 to April 5, the average Rt calculated on symptomatic cases was equal to 0.96 (range 0.92-1.02), little below the epidemic threshold, the previous week was at an altitude of 1. According to the main data that emerged, released by the Higher Institute of Health, the hospital RT, the transmissibility index based on cases with hospitalization is below the epidemic threshold and substantially stable compared to the previous week: it stands at 0.91 (0.88-0.93) as of 12 April, against the value of 0.92 (0.9-0.94) recorded as of 05 April.