CDC OutbreakNet Enhanced 2021 Cumulative Metrics Data: Salmonella, Shiga Toxin-Producing Escherichia coli, Listeria, Shigella, and Campylobacter [SSL(SC)]
Report Period: [January 1, 2021] to [December 31, 2021]
| SSL(SC) Performance Metrics: (See associated document for complete language and definitions) | Salmonella Measures Mean (Range) | STEC1 Measures Mean (Range) | Listeria Measures Mean (Range) | Shigella Measures2 Mean (Range) | Campylobacter Measures2 Mean (Range) |
|---|---|---|---|---|---|
| 1a. Total number of SSL(SC) isolates and isolate-yielding specimens submitted to or recovered at the Public Health Lab (PHL) | 1136 (23 – 5,583) | 210 (7 – 789) | 24 (0 – 108) | 87 (0 – 249) | 169 (0 – 962) |
| 1b. Number of SSL(SC) primary isolates or isolate-yielding specimens | 1030 (16 – 5,178) | 172 (7 – 699) | 20 (0 – 64) | 96 (0 – 612) | 143 (0 – 935) |
| 2a. Total number of preliminary positive SSL(SC) clinical specimens or samples received at PHL (regardless of if isolate-yielding or not) | 480 (2 – 1,594) | 301 (15 – 1075) | 11 (0 – 51) | 108 (1 – 666) | 188 (0 – 879) |
| 2b. Total number and percent of isolate-yielding SSL(SC) clinical specimens or samples received at PHL | 469 (18 – 1,266); 83.0% (53% – 99.8%) | 178 (7 – 785); 50.1% (26.7% – 67%) | 15 (0 – 51); 84.1% (0.5% – 100%) | 53 (0 – 155); 54.6% (0% – 100%) | 160 (0 – 879); 56.6% (0% – 100%) |
| 3b. Percent of SSL(SC) primary isolates with WGS testing at PHL | 93.5% (67.6% – 100%) | 87.2% (5% – 100%) | 87.9% (0% – 100%) | 52.6% (0% – 100%) | 34.8% (0% – 100%) |
| 5a. Total number of SSL(SC) cases reported to public health | 1,150 (19 – 6,419) | 313 (7 – 1,698) | 21 (1 – 82) | 259 (4 – 2,551) | 1,271 (90 – 3,948) |
| 5ai. OPTIONAL: Percent of SSL(SC) cases with isolates and isolate- yielding specimens submitted to PHL | 85.7% (76.5% – 93.1%) | 73.3% (60% – 90.9%) | 78.2% (0% – 100%) | 57.4% (0.8% – 89.8%) | 40.1% (0% – 71%) |
| 5b. Total number of laboratory confirmed SSL(SC) cases reported to epidemiology staff | 970 (19 – 5,531) | 136 (5 – 847) | 19 (0 – 79) | 137 (2 – 1,424) | 532 (53 – 1,548) |
| 5c. Total number of probable SSL(SC) cases reported to epidemiology staff | 180 (0 – 884) | 155 (2 – 851) | 1 (0 – 3) | 121 (0 – 1,127) | 737 (37 – 2,815) |
| 5d. Total number of suspect SSL(SC) cases reported to epidemiology staff | N/A | 26.5 (0 – 139) | 0.4 (0 – 3) | N/A | N/A |
| 6a. Percent of SSL(SC) cases with attempted interview | 84.5% (2.6% – 100%) | 91.2% (50.5% – 100%) | 92.8% (63.6% – 100%) | 77.3% (0% – 100%) | 69.2% (0% – 100%) |
| 6ai. Percent of laboratory confirmed cases with attempted interview | 83.9% (2.6% – 100%) | 93.0% (73.7% – 100%) | 88.5% (0% – 100%) | 81.3% (9% – 100%) | 72.1% (0% – 100%) |
| 6aii. Percent of probable cases with attempted interview | 87.1% (0% – 100%) | 92.7% (47.4% – 100%) | No cumulative data available | 80.0% (12% – 100%) | 66.7% (0% – 100%) |
| 6aiii. Percent of suspect cases with attempted interview | N/A | 64.2% (0% – 100%) | N/A | N/A | N/A |
| 6b. Median time from SSL(SC) case report to initial interview attempt | 3.4 (<1 – 20) days | 2.4 (<1 – 18) days | 2.1 (<1 – 10) days | 2.2 (<1 – 8) days | 2.7 (<1 – 10) days |
| 6c. Percent of SSL(SC) cases with exposure history obtained | 69% (0.9% – 100%) | 72.8% (1.2% – 100%) | 70.2% (0% – 100%) | 70.0% (5% – 100%) | 66.4% (6% – 100%) |
| 6ci. OPTIONAL: Among SSL(SC) cases with an exposure history, percent with full shotgun or case exposure completed | 71.4% (0% – 100%) | 65.9% (0% – 100%) | 79.4% (25% – 100%) | 73.3% (0% – 100%) | 65% (0% – 100%) |
| 6cii. OPTIONAL: Time from case report to when an exposure history is obtained | 5 (2 – 21) days | 3.6 (1 – 19) days | 5.5 (1 – 24) days | 2.4 (1 – 4) days | 2.9 (1 – 7) |
| 7. Number of SSL(SC) clusters | 26.0 (5 – 79) | 7.6 (0 – 45) | 2.2 (0 – 8) | 1.8 (0 – 10) | 1.4 (0 – 8) |
| 8a. OPTIONAL: Total number and percent of SSL(SC) clusters with routine interview of cases3 | 22.7 (5 – 68); 95.4% (71.4% – 100%) | 6.9 (1 – 45); 98.8% (82.8% – 100%) | 2.2 (1 – 5); 90.5% (33.3% – 100%) | 1.9 (0 – 5); 87.5% (0% – 100%) | 1.8 (1 – 3); 100% |
| 8b.Total number and percent of SSL(SC) clusters where an analytic epidemiologic study was conducted3 | 6.9 (0 – 27); 42.5% (0% – 100%) | 2.2 (0 – 12); 37.3% (0% – 100%) | 0.9 (0 – 3); 38.8% (0% – 100%) | 0.6 (0 – 2); 35.6% (0% – 100%) | 0.6 (0 – 1); 42.6% (0% – 100%) |
| 9a. Total number and percent of SSL(SC) clusters with confirmed vehicle/source identified3 | 6.5 (1 – 16); 35.3% (4% – 63%) | 1 (0 – 5); 16.5% (0% – 50%) | 0.7 (0 – 3); 22% (0% – 100%) | 0.1 (0 – 1); 2.2% (0% – 20%) | 0.9 (0 – 3); 47.9% (0% – 100%) |
| 9b. OPTIONAL: Total number and percent of SSL(SC) clusters with suspect vehicle/source identified3 | 4.4 (0 – 20); 13.4% (0% – 39.2%) | 1.8 (0 – 7); 28.5% (0% – 100%) | 1.3 (0 – 4); 33.2% (0% – 100%) | 0.2 (0 – 1); 16.7% (0% – 100%) | 0.6 (0 – 2); 20% (0% – 67%) |
| 10. Total number and percent of SSL(SC) clusters where food or environmental sample collected for testing3 | 4 (0 – 13); 20.5% (0% – 81.3%) | 1.1 (0 – 3); 26.3% (0% – 100%) | 0.9 (0 – 3); 33.4% (0% – 100%) | 0.3 (0 – 1); 16.1% (0% – 100%) | 0.5 (0 – 2); 27.8% (0% – 100%) |
| 11. Total number and percent of SSL(SC) clusters where environmental health, agriculture, regulatory, or food safety program staff were contacted3 | 14.6 (1 – 79); 52.6% (2% – 100%) | 5.5 (0 – 29); 70.9% (11% – 100%) | 2.6 (0 – 7); 80.7% (0% – 100%) | 0.7 (0 – 3); 38.5% (0% – 100%) | 1.4 (0 – 3); 61.9% (0% – 100%) |
| 12a.Total number of SSL(SC) outbreaks, excluding multi-state outbreaks | 5 (0 – 49) | 2.5 (0 – 22) | 0.1 (0 – 1) | 0.4 (0 – 3) | 0.9 (0 – 3) |
| 12b.Total number and percent of SSL(SC) outbreaks, excluding multi-state outbreaks, reported/sumbsitted to NORS | 3.5 (0 – 19): 80% (0% – 100%) | 2.2 (0 – 10); 82.9% (29% – 100%) | No cumulative data available | No cumulative data available | 2.2 (1 – 3); 100% |
All data are cumulative. Data are only reported when available from 5 or more sites.
- Shiga Toxin-producing Escherichia coli
- Reporting is optional for Shigella and Campylobacter
- This metric is calculated for only those sites that reported having clusters in Metric 7.
*OutbreakNet Enhanced sites reported on 2021 metrics in 2022. Performance measures where n<29 may be indicative of limitations in reporting due to restricted staff capacity as state and local health departments prioritized activities related to COVID-19 response efforts.
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