Before revision: Oral Poliovirus Vaccine Oral Poliovirus Vaccine (OPV) was developed in the 1950s by Dr. Albert Sabin and is made from live attenuated polioviruses of three serotypes.Sabin, AB.
After revision: But critical researchers estimated that millions of child deaths in low-income countries could be prevented every year if the WHO modified immunization schedules based on the available URLOral Poliovirus Vaccine Oral Poliovirus Vaccine (OPV) was developed in the 1950s by Dr. Albert Sabin and is made from live attenuated polioviruses of three serotypes.Sabin, AB.