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Table 2 Date of first detection for Children's National Medical Center (CNMC) and six other DC hospitals and CDC's sentinel physician surveillance system (South Atlantic states) over four years with the first system to flag each year highlighted in bold and underlined and the number of days delay for the other systems shown below the date of flagging.

From: Early detection of influenza outbreaks using the DC Department of Health's syndromic surveillance system

   Year
Surveillance system 2002 2003 2004 2005 2006
CNMC Dec 31 -- Nov 24
+2
Jan 2 Feb 27 +23
Other DC hospitals Jan 4
+4
-- Dec 8
+14
Jan 4
+2
-
CDC sentinel physicians Jan 26 +26 Feb 1 Nov 22 Jan 22
+20
Feb 4