Conversation so far:
How did Salk get involved in Polio research?
Salk became ambitious for his own lab.
Where was his lab located?
University of Pittsburgh.
Did anyone assist with his research?
assisted by the staff at the D.T.
Watson Home for Crippled Children.
How did he fund his research?
involving 100 million contributors to the March of Dimes.
Did his research lead to a vaccine being made?
Salk's inactivated polio vaccine was the first vaccine for the disease.
What year was the vaccine introduced for use?
1955.
Are there any other interesting aspects about this article?
It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system.

Question: How long did it take Salk to finish his polio vaccine?
Self-contained rewrite: How long did it take Jonas Salk to finish his polio vaccine?