Historical clue formulations

• Virus first discovered in 1976 — 2025-01-28
• Virus in 2014 news — 2023-07-10
• Virus named for a river in Africa — 2023-05-22
• Its index case occurred in Meliandou, Guinea — 2023-02-17
• African river with a notorious name — 2022-06-03
• Cause of a 2014 scare — 2021-06-11
• Virus first discovered in 1976 — 2019-07-24
• Dangerous virus — 2018-06-20
• Virus carried by fruit bats — 2017-06-29
• Virus in 2014 news — 2017-05-15
• African virus — 2016-11-01
• Subject of some 2015 border control measures — 2016-09-28
• Menace in 2014 news — 2016-09-11
• Virus in 2014 news — 2016-06-22
• Challenge for a virologist — 2015-10-18
• Cause of a 2014 epidemic — 2015-08-30
• What fruit bats can carry — 2015-05-23
• Menace named after an African river — 2014-07-06
• African virus — 2012-12-12
• Virus that arose in the Congo — 2012-10-03
• African virus — 2012-08-21
• "The Hot Zone" virus — 2012-04-18
• Virus named for a river — 2011-07-31
• "The Hot Zone" topic — 2011-03-13
• Jungle menace — 2011-01-26
• Virus named for a river — 2010-08-26
• Deadly virus — 2010-04-12
• "The Hot Zone" virus — 2009-06-24
• Nasty virus — 2009-01-20
• Virulent virus — 2008-01-06
• Virus named for a river — 2007-11-06
• Deadly virus — 2007-09-11
• Dreaded virus — 2004-08-26
• Deadly virus — 2004-02-29
• African scourge — 2001-12-14
• "The Hot Zone" topic — 2000-10-29
• African threat — 2000-05-05
• African virus — 1999-11-25
• Deadly virus — 1999-09-24
• Deadly African virus — 1999-05-16
• African virus — 1999-02-21
• Deadly virus — 1998-06-21
• Dangerous strain — 1998-02-22
• Zaire menace — 1996-09-26
• "The Hot Zone" virus — 1996-02-25
• African virus — 1995-08-15