We immunized ferrets (n = 12 per group) with either phosphate-buffered saline, CA09 inactivated influenza vaccine (IIV), a trivalent wild-type HA-Np combination (NC99+CA09+HK77), or a combination of COBRA P1+COBRA X6+HK77 HA-Nps. The gene discussed is NPS; the disease is influenza.