A poor and delayed anti-SARS-CoV2 IgG response is associated to severe COVID-19 in children. - Sananez I; Raiden SC; Algieri SC; Uranga M; Grisolía NA; Filippo D; De Carli N; Lalla SD; Cairoli H; Chiolo MJ; Meregalli CN; Cohen E; et al. (EBioMedicine, 2021)