Table 1.
Clinical, food, and environmental samples associated with the outbreak investigation, including sample source, outbreak strain, and Whole Genome Sequencing Clade. Numbers in parentheses in the ‘Sample/Isolate Type’ column indicate the total number of isolates.
| Sample/Isolate Type | Sample/Isolate Year | Additional Details | Source | Collected By | Outbreak Strain | WGS Clade |
|---|---|---|---|---|---|---|
| Clinical (8) | 2013–2016 | CT (1), CA (4), MD (1), WA (1), VA (1) | Ill people | States | Strain 1 | Clade A |
| 1 Environmental Sample (2) | 2016 | Manufacturer A | FDA | |||
| 1 Food Sample (1) | 2016 | Frozen white sweet corn | Manufacturer B | ODA | ||
| 2 Food Samples (2)a | 2016 | Frozen mixed vegetables | Manufacturer B | CDPH | ||
| 2 Food Samples (7)b | 2016 | Frozen mixed vegetables | Manufacturer B | CDPH | ||
| 1 Food Sample (1)a | 2016 | Frozen baby peas | Manufacturer B | IDHW | ||
| Food (3)c | 2015 | Green beans | WA | Unk | Strain 1 | Clade A |
| Food (2)c | 2014 | Onions | WA | Unk | Strain 1 | Clade A |
| Clinical (1) | 2016 | CA (1) | Ill person | State | Strain 2 | Clade B |
| 1 Food Sample (1) | 2016 | Frozen petite green peas | Manufacturer B | ODA | Strain 2 | Clade B |
| 2 Food Samples (3)b | 2016 | Frozen mixed vegetables | Manufacturer B | CDPH | Strain 2 | Clade B |
| Food (1)c | 2015 | Green beans | WA | Unk | Strain 2 | Clade B |
| Food (1)c | 2010 | Potatoes | MN | Unk | Strain 2 | Clade B |
| Environmental (32)c | 2015 | WA | Unk | Strain 2 | Clade B | |
| 1 Environmental Sample (17) | 2016 | Manufacturer A | FDA | N/A | Clade C |
a Isolates analyzed by FDA.
b Isolates analyzed by CDPH.
c Isolates submitted to GenomeTrakr with minimal metadata.