Smart answer:
Your search for ′Who developed the polio vaccine′ returned the following results:
by Jonas Salk
The first successful polio vaccine, developed by Jonas Salk and licensed for use in 1955, was injected.
Source:
Jonas Salk , a researcher in Pittsburgh,
Jonas Salk, a researcher in Pittsburgh, developed the first polio vaccine in 1955, an injection of dead virus.
Source:
Jonas Salk, a virologist at the University of Pittsburgh,
In 1952, Jonas Salk, a virologist at the University of Pittsburgh, created the first stable and effective polio vaccine.
Source:
a research team headed by a Dr. Jonas Salk
Then in 1955, a research team headed by a Dr. Jonas Salk perfected a polio vaccine.
Source: