Final answer:
Albert Sabin developed the attenuated virus part of the polio vaccine.
Step-by-step explanation:
The attenuated virus part of the polio vaccine was developed by Albert Sabin. The Sabin vaccine, introduced in 1962, contains an attenuated virus that helps provide immunity against the three serotypes of poliovirus that cause disease in humans. Unlike the Salk vaccine, which is administered by injection, the Sabin vaccine is an oral polio vaccine.