After the war, in 1947, Jonas Salk was offered his own laboratory at the University of Pittsburgh School of Medicine.
If you were a scientist in Salk's time, you did calculations by hand and wrote observations in notebooks.
Jonas Salk, of the University of Pittsburgh, developed the first successful polio vaccine from inactivated poliomyelitis.
On the research team of the eminent virologist Dr. Thomas Francis, who was working on a flu vaccine, was a young physician named Jonas Salk.
Hundreds of thousands of cases were still, of course, in the rest of the world even three decades after Salk's breakthrough.