This is not the case with the vaccine devised to combat smallpox or variola virus. The smallpox vaccine is not a form of variola virus, but a preparation of vaccinia (a form of cowpox) virus.
[14] Alternative candidates based on attenuated vaccinia strains, third-generation vaccines, may offer more favorable therapeutic ratios. Sanofi Pasteur smallpox vaccine (SPSV) NYCBH Produced in ...