The SARS-CoV-2 B.1.1.529 Omicron virus causes attenuated infection and disease in mice and hamsters. - Diamond M; Halfmann P; Maemura T; Iwatsuki-Horimoto K; Iida S; Kiso M; Scheaffer S; Darling T; Joshi A; Loeber S; Foster S; Ying B; et al. (Research square, 2021)