Possible Clues:

• Health scare of 2002-2003
• 2002-'03 viral outbreak, briefly
• 2002-2003 epidemic
• Respiratory disease in 2002 news
• 2003 outbreak
• Cause of some 2002-2003 travel warnings
• 2002 outbreak
• 2003 scare, briefly
• Modern epidemic
• 2002-2003 outbreak monitored by the WHO