Schematic representation of the immunization regimens used in this study. Schematic representation of the immunization regimens used in this study. BALB/c mice (n = 5/group) were immunized through an i.n. infection with COBRA or H1N1 viruses described in this study and i.p. or i.m. boosted with the homologous virus. Alternatively, mice (n = 5/group) were primed through an i.p. or i.m. immunization containing COBRA P1 virus and again i.p. or i.m. boosted with the homologous virus. Giuseppe A. Sautto et al. ImmunoHorizons 2018;2:226-237 Copyright © 2018 The Authors