The benefit of the attenuated live virus is that it can replicate and go on to infect others, spreading protection from virulent polio to unvaccinated people.
One of the covid-19 origin theories was that China was trying to make an attenuated live virus SARS vaccine that would self propagate through the population
One of the covid-19 origin theories was that China was trying to make an attenuated live virus SARS vaccine that would self propagate through the population