Volume 13, Number 2—February 2007
Research
Code-based Syndromic Surveillance for Influenzalike Illness by International Classification of Diseases, Ninth Revision
Nicola Marsden-Haug*1, Virginia B. Foster*, Philip L. Gould†, Eugene Elbert*2, Hailiang Wang*, and Julie A. Pavlin*3
Table 3
Data showing match of Air Force respiratory virus specimens to ICD-9 coded visits, January 2002–July 2003*
| No. visits/type | No. specimens |
|---|---|
| 2 visits recorded (n = 321) | |
| Both non-ILI | 90 |
| 1 ILI; 1 non-ILI | 164 |
| Both ILI | 67 |
| 3 visits recorded (n = 12) | |
| 3 non-ILI | 6 |
| 1 ILI; 2 non-ILI | 5 |
| 2 ILI; 1 non-ILI | 1 |
| 4 visits recorded (n = 1) | |
| 1 ILI; 3 non-ILI | 1 |
*ICD-9, International Classification of Diseases, Ninth Revision; ILI, influenza-like illness.
†No. specimens obtained by day of matching visit.
