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Arup K. Chakraborty

Dr. Jonas Salk stands in the University of Pittsburgh laboratory in which he developed a vaccine for polio. | Dr. Albert Bruce Sabin, of the University of Cincinnati College of Medicine, holds a vial containing a newly developed oral polio vaccine. (Photo illustration by Salon/Getty Images)

How a debate over two competing vaccines gripped the medical community — in 1961

Arup K. Chakraborty, Andrey S. Shaw