Oral tablet vaccination against SARS-CoV-2 spike boosts cross-reactive serum and mucosal neutralizing antibodies following mRNA vaccination: a phase 2 clinical trial - johnson, susan; Jegede, Clara B; Gutierrez, Samanta; Greco, Susan; Cummings, James; Gottlieb, Keith A; Tucker, Sean N (The Journal of immunology (1950), 2023)