Here, for the moderately virulent CSFV strain Alfort/187 as well as for the highly virulent strain Eystrup we show that the respective N(pro)-deleted viruses are attenuated. Vaccination of pigs with either of the two deletion mutants resulted in the induction of a strong antibody response. Animals were protected against challenge with a lethal dose of highly virulent CSFV indicating that N(pro) deletion mutants are excellent candidates for a modified live virus vaccine. (Mayer et al., 2004)
References
Mayer et al., 2004: Mayer D, Hofmann MA, Tratschin JD. Attenuation of classical swine fever virus by deletion of the viral N(pro) gene. Vaccine. 2004; 22(3-4); 317-328. [PubMed: 14670312].