Intranasal immunization with an RBD-hemagglutinin fusion protein harnesses preexisting immunity to enhance antigen-specific responses

Atsushi Kawai, Nagisa Tokunoh, Eigo Kawahara, Shigeyuki Tamiya, Shinya Okamura, Chikako Ono, Jessica Anindita, Hiroki Tanaka, Hidetaka Akita, Sho Yamasaki, Jun Kunisawa, Toru Okamoto, Yoshiharu Matsuura, Toshiro Hirai, Yasuo Yoshioka^*