Breakthrough Infections of E484K-Harboring SARS-CoV-2 Delta Variant, Lombardy, Italy. - Baj, Andreina; Novazzi, Federica; Pasciuta, Renee; Genoni, Angelo; Ferrante, Francesca Drago; Valli, Marilena; Partenope, Michele; Tripiciano, Rosalia; Ciserchia, Andrea; Catanoso, Giuseppe; Focosi, Daniele; Maggi, Fabrizio (Emerging Infectious Diseases, 2021)