Heterologous Systemic Prime–Intranasal Boosting Using a Spore SARS-CoV-2 Vaccine Confers Mucosal Immunity and Cross-Reactive Antibodies in Mice as well as Protection in Hamsters

Paidamoyo Katsande, Leira Fernandez-Bastit, William Ferreira, Julia Vergara-Alert, Mateusz Hess, Katie Lloyd-Jones, Huynh A Hong, Joaquim Segales, Simon Cutting