The application discloses a novel
coronavirus vaccine based on controllable
secretion expression of attenuated
salmonella, a preparation method and application thereof, and is used for preventing the novel
coronavirus. The application constructs controllable, stable and secretory expression plasmids of different
antigen domain proteins of the novel
coronavirus and attenuated
salmonella expression strains of the different
antigen domain proteins; a plurality of attenuated
salmonella antigen presentation strains which can controllably and secretively express in antigen presenting cells are mixed, and through an
oral route, the plurality of different antigen proteins can be efficiently secretively expressed in the antigen presenting cells by means of the unique
secretion system of the attenuated salmonella after administration. The secretively expressed antigenic proteins can be effectively processed and presented by the antigen presenting cells, and finally the
immune system is activated / regulated, higher
titer antibodies are generated, and the vaccine plays a role.