Historical clue formulations

• Antipolio pioneer — 2014-07-31
• Polio vaccine developer — 2013-01-20
• Polio vaccine pioneer — 2012-08-08
• Vaccine pioneer — 2011-02-20
• Albert with a National Medal of Science — 2010-03-13
• ___ vaccine — 2009-08-29
• Salk contemporary — 2009-01-21
• Polio vaccine developer — 2007-04-30
• Polio vaccine developer — 2006-10-18
• Oral vaccine developer — 2001-03-04
• Polio vaccine developer — 1997-03-31
• Noted virologist — 1996-11-16
• Polio vaccine developer — 1996-10-09
• Vaccine developer — 1995-08-31
• Polio was his target — 1994-04-24
• Vaccine name — 1994-04-23
• Polio fighter — 1993-12-10