Fc effector activity and neutralization against SARS-CoV-2 BA. 4 is compromised in convalescent sera, regardless of the infecting variant SI Richardson, P Kgagudi, NP Manamela, H Kaldine, EM Venter, T Pillay, ... bioRxiv, 2022.07. 14.500042, 2022 | 4 | 2022 |