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Volume 3, Number 3—September 1997

Dispatch

Using Laboratory-Based Surveillance Data for Prevention: An Algorithm for Detecting Salmonella Outbreaks

L. C. Hutwagner, E. K. Maloney, N. H. Bean, L. Slutsker, and S. M. Martin
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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Table 2

Sensitivity and specificity for 1993 of the Salmonella outbreak detection algorithm and of known outbreaks of Salmonella serotype Enteritidis

ST Sensitivity
No. flagged wks/No. outbreaks (%)
Specificity
No. nonflagged wks/No. possible nonflagged wks (%)
False positive (Pf+)
nonoutbreak flags/No. flags (%)
Mean
5 wks Mean
15 wks Median
5 wks Mean
5 wks Mean
15 wks Median
5 wks Mean
5 wks Mean
15 wks Median
5 wks
AK 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
AZ 0/0 0/0 0/0 51/52 (98) 51/52 (98) 51/52 (98) 1/1 (1) 1/1 (1) 1/1 (1)
AR 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
CO 0/0 0/0 0/0 51/52 (98) 51/52 (98) 51/52 (98) 1/1 (1) 1/1 (1) 1/1 (1)
CT 5/6 (83) 5/6 (83) 5/6 (83) 39/46 (85) 39/46 (85) 36/46 (78) 4/9 (44) 5/10 (50) 16/21 (76)
DE 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
DC 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
FL 0/1 0/1 0/1 51/52 (98) 51/52 (98) 51/52 (98) 1/1 (1) 1/1 (1) 1/1 (1)
GA 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
HI 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
ID 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
IL 1/1 (100) 1/1 (100) 1/1 (100) 16/25 (64) 16/25 (64) 6/25 (24) 11/12 (92) 11/12 (92) 22/23 (96)
IN 0/0 0/0 0/0 45/52 (87) 45/52 (87) 44/52 (85) 7/7 (1) 7/7 (1) 8/8 (1)
IA 1/1 (100) 1/1 (100) 1/1 (100) 51/51 (100) 51/51 (100) 51/51 (100) 0/1 (0) 0/1 (0) 0/1 (0)
KS 1/1 (100) 1/1 (100 ) 1/1 (100) 51/51 (100) 51/51 (100) 51/51 (100) 0/1 (0) 0/1 (0) 0/1 (0)
KY 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
LA 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
MD 3/4 (75) 3/4 (75) 4/4 (100) 44/48 (92) 43/48 (90) 31/48 (65) 1/4 (25) 2/5 (40) 16/20 (80)
MA 0/0 0/0 0/0 47/52 (90) 47/52 (90) 43/52 (83) 5/5 (1) 5/5 (1) 9/9 (1)
MI 0/0 0/0 0/0 45/52 (87) 45/52 (87) 43/52 (83) 7/7 (1) 7/7 (1) 9/9 (1)
MN 0/0 0/0 0/0 46/52 (88) 46/52 (88) 46/52 (88) 6/6 (1) 6/6 (1) 6/6 (1)
MO 0/0 0/0 0/0 51/52 (98) 51/52 (98) 51/52 (98) 1/1 (1) 1/1 (1) 1/1 (1)
NV 0/0 0/0 0/0 51/52 (98) 51/52 (98) 51/52 (98) 1/1 (1) 1/1 (1) 1/1 (1)
NH 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
NJ 1/2(50) 1/2(50) 2/2 (100) 44/50 (88) 44/50 (88) 28/50 (56) 6/7 (86) 6/7 (86) 22/24 (92)
NM 0/0 0/0 0/0 48/52 (92) 48/52 (92) 48/52 (92) 4/4 (1) 4/4 (1) 4/4 (1)
NY 7/10 (70) 7/10 (70) 8/10 (80) 41/42 (98) 40/42 (95) 35/42 (83) 7/7 (0) 7/7 (0) 10/18 (56)
ND 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
OH 0/0 0/0 0/0 45/52 (87) 44/52 (85) 41/52 (79) 7/7 (1) 8/8 (1) 11/11 (1)
OK 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
OR 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
PA 1/1 (100) 1/1 (100) 1/1 (100) 3/3 (100) 3/3 (100) 3/3 (100) 0/1 (0) 0/1 (0) 0/1 (0)
RI 0/0 0/0 0/0 50/52 (96) 50/52 (96) 50/52 (96) 2/2 (1) 2/2 (1) 2/2 (1)
SC 1/1 (100) 1/1 (100) 1/1 (100) 51/51 (100) 51/51 (100) 51/51 (100) 1/1 (0) 1/1 (0) 1/1 (0)
SD 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
TN 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
TX 2/2 (100) 2/2 (100) 2/2 (100) 48/50 (96) 48/50 (96) 48/50 (96) 3/5 (60) 3/5 (60) 3/5 (60)
UT 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
VT 5/6 (83) 5/6 (83) 5/6 (83) 43/46 (93) 43/46 (93) 43/46 (93) 4/9 (44) 4/9 (44) 5/10 (50)
VA 0/1 (0) 0/1 (0) 0/1 (0) 43/51 (84) 43/51 (84) 35/51 (69) 8/8 (1) 9/9 (1) 16/16 (1)
WV 0/0 0/0 0/0 52/52 (100) 52/52 (100) 52/52 (100)
WI
1/1 (100)
1/1 (100)
1/1 (100)
40/51 (78)
40/51 (78)
38/51 (75)
12/13 (92)
12/13 (92)
14/15 (93)
Total 29/38 (76) 29/38 (76) 32/38 (82) 1978/2072 (95) 1975/2072 (95) 1909/2072 (92) 92/121 (76) 96/125 (77) 178/210 (85)

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