Efficacy of Heterologous Prime-Boost Vaccination with H3N2 Influenza Viruses in Pre-Immune Individuals: Studies in the Pig Model, Sharon, Chepkwony, Parys Anna, Elien Vandoorn, Chiers Koen, and Van Reeth Kristien , Viruses, Jan-09-2020, Volume 12, Issue 9, (2020)