IFNG and COVID-19: A combined vaccine consisting of two immunogenic spike protein regions and a full-length N antigen formulated with aluminum hydroxide with or without monophosphoryl lipid A was studied by Özcengiz et al. The authors demonstrated recognition of the recombinant proteins by the sera of COVID-19 convalescents, as well as induction of high titers of anti-P1, anti-P2 and anti-N IgG (including neutralizing antibodies) and interferon-gamma (IFN-γ) secreting T cells in mice.