The Sabin vaccine, though easier to use and highly effective, was made from live attenuated viruses, some of which apparently retained their infectious potential.

If people given the Sabin vaccine are exposed to polio, the immunity in their gut will stop them from excreting the live virus.

Dr. Salk felt that the success attributed to the Sabin vaccine deprived him of the recognition he was due.

The Sabin vaccine worked in the intestines to block the poliovirus from entering the bloodstream.

After travelling to remote communities, she would treat children with the Sabin vaccine in sugar lumps.

However, a year and a half after the Salk vaccine was introduced, a Sabin vaccine had still not yet been tested on humans.

More important, the Sabin vaccine, which is taken orally, immunizes the digestive tract.

She guardedly concluded that the findings were reliable and that the Sabin vaccine was safe and effective.

The second vaccine is the Sabin vaccine, which is a live attenuated vaccine.

Between 1962 and 1965 about 100 million Americans (roughly 56% of the population at that time) received the Sabin vaccine.