A cluster of the new SARS‐CoV‐2 B.1.621 lineage in Italy and sensitivity of the viral isolate to the BNT162b2 vaccine. Issue 12 (10th August 2021) - Messali, Serena; Bertelli, Anna; Campisi, Giovanni; Zani, Alberto; Ciccozzi, Massimo; Caruso, Arnaldo; Caccuri, Francesca