Previous COVID-19 associated with greater post-vaccination antibodiesAfter vaccination with an mRNA-based COVID-19 shot, antibody levels for immunoglobulin G (IgG) were higher in the short term in healthcare workers (HCWs) who had previous COVID-19 infections than those who had never had the disease, according to a research letter published yesterday in JAMA.The authors recruited their pool of 59 HCWs from a previous serosurvey at the University of Maryland Medical Center, dividing the cohort into three groups: SARS-CoV-2 IgG-antibody negative (17 HCWs), IgG-positive with asymptomatic COVID (16), and IgG-positive with symptomatic COVID (26).