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 |