Related Clues:

• See 6-Across
• Salk's conquest
• Old disease
• F.D.R. affliction
• Salk vaccine's target
• Bygone epidemic cause
• Vaccine target
• Salk vaccine target
• Largely eradicated disease
• Affliction FDR was diagnosed with
• Target of the Salk vaccine
• Jonas Salk's target
• Dr. Salk's conquest
• F.D.R.'s affliction
• Salk's target