Answer:

polio

Answer	Crossword Clue
POLIO	Study for Dr. Albert Sabin
POLIO	Salk vaccine target
POLIO	Vaccine target

POLIO	Subject of the 1954 Nobel Prize in Medicine
POLIO	Sabin's study
POLIO	Challenge for F.D.R.
POLIO	F.D.R.'s affliction
POLIO	Bygone epidemic cause
POLIO	Salk's conquest
POLIO	F.D.R. affliction
POLIO	Old disease

POLIO	Salk's target