The family Baculoviridae is a highly selective pathogen in arthropods,mainly in insects of the order Lepidoptera. Ac110 is one of the per os infectivity factors that are essential for the initial infection of lavae in midgut cells,but the mechanism by which Ac110 employs that affect the midgut infection is still unknown. In the present study,two recombinant viruses,v Ac110N27 A and v Ac110L35 A were generated in which the conserved amino acids N27 and L35 of Ac110 were mutated to alanine,respectively. The e...