Confidence in the efficacy of different preparations of live vaccinia vaccines is based on the fact that these vaccines contain the complete virus, and the virus causes a limited infection in the vaccinated person.
(Confidence in the efficacy of different preparations of live vaccinia vaccines; is based; on the fact that these vaccines contain the complete virus) (these vaccines; contain; the complete virus) (the virus; causes; a limited infection in the vaccinated person)
Confidence in the efficacy of different preparations of live vaccinia vaccines these vaccines the virus
is based contain causes
on the fact that these vaccines contain the complete virus
the complete virus
a limited infection in the vaccinated person