Variable | Interpretations |
| Individuals who are at risk of contracting Listeriosis infections. |
| Individuals who are showing symptoms of Listeriosis infections. |
| Individuals who have recovered from Listeriosis infections. |
| Animals that are at risk of contracting Listeriosis infections. |
| Animals that are showing symptoms of Listeriosis infections. |
| Animals that have recovered from Listeriosis infections. |