diff --git a/data-serving/reusable-data-service/data_service/day_zero_fields.json b/data-serving/reusable-data-service/data_service/day_zero_fields.json
index d5ae2cbc4..20e95d6bf 100644
--- a/data-serving/reusable-data-service/data_service/day_zero_fields.json
+++ b/data-serving/reusable-data-service/data_service/day_zero_fields.json
@@ -18,6 +18,17 @@
             "omit_error"
         ]
     },
+    {
+        "key": "pathogenStatus",
+        "type": "string",
+        "data_dictionary_text": "Whether the infection occured in an endemic, or non-endemic region.",
+        "required": "true",
+        "values": [
+            "endemic",
+            "emerging",
+            "unknown"
+        ]
+    },
     {
         "key": "confirmationDate",
         "type": "date",
diff --git a/data-serving/reusable-data-service/tests/data/case.excluded.json b/data-serving/reusable-data-service/tests/data/case.excluded.json
index f9be1e501..bf54aba34 100644
--- a/data-serving/reusable-data-service/tests/data/case.excluded.json
+++ b/data-serving/reusable-data-service/tests/data/case.excluded.json
@@ -7,5 +7,6 @@
         "date": "2022-06-01T01:23:45.678Z",
         "note": "Excluded upon this day, for reasons"
     },
-    "caseStatus": "omit_error"
+    "caseStatus": "omit_error",
+    "pathogenStatus": "endemic"
 }
\ No newline at end of file
diff --git a/data-serving/reusable-data-service/tests/data/case.minimal.json b/data-serving/reusable-data-service/tests/data/case.minimal.json
index 8fd3ef798..1c21bfbb0 100644
--- a/data-serving/reusable-data-service/tests/data/case.minimal.json
+++ b/data-serving/reusable-data-service/tests/data/case.minimal.json
@@ -3,5 +3,6 @@
     "caseReference": {
         "sourceId": "fedc09876543210987654321"
     },
-    "caseStatus": "probable"
+    "caseStatus": "probable",
+    "pathogenStatus": "emerging"
 }
\ No newline at end of file
diff --git a/data-serving/reusable-data-service/tests/data/case.with_location.json b/data-serving/reusable-data-service/tests/data/case.with_location.json
index f1a629bda..7f9dbcfe5 100644
--- a/data-serving/reusable-data-service/tests/data/case.with_location.json
+++ b/data-serving/reusable-data-service/tests/data/case.with_location.json
@@ -16,5 +16,6 @@
             "country": "IND"
         }
     },
-    "caseStatus": "probable"
+    "caseStatus": "probable",
+    "pathogenStatus": "unknown"
 }
\ No newline at end of file
diff --git a/data-serving/reusable-data-service/tests/test_case_model.py b/data-serving/reusable-data-service/tests/test_case_model.py
index 822ec29f1..f17a20605 100644
--- a/data-serving/reusable-data-service/tests/test_case_model.py
+++ b/data-serving/reusable-data-service/tests/test_case_model.py
@@ -31,7 +31,7 @@ def test_csv_header():
     header_line = Case.csv_header()
     assert (
         header_line
-        == "_id,caseStatus,confirmationDate,caseReference.sourceId,location.country,location.latitude,location.longitude,location.admin1,location.admin2,location.admin3\r\n"
+        == "_id,caseStatus,pathogenStatus,confirmationDate,caseReference.sourceId,location.country,location.latitude,location.longitude,location.admin1,location.admin2,location.admin3\r\n"
     )
 
 
@@ -44,8 +44,9 @@ def test_csv_row_with_no_id():
     case.confirmationDate = date(2022, 6, 13)
     case.caseReference = ref
     case.caseStatus = "probable"
+    case.pathogenStatus = "emerging"
     csv = case.to_csv()
-    assert csv == ",probable,2022-06-13,abcd12903478565647382910,,,,,,\r\n"
+    assert csv == ",probable,emerging,2022-06-13,abcd12903478565647382910,,,,,,\r\n"
 
 
 def test_csv_row_with_id():
@@ -59,8 +60,9 @@ def test_csv_row_with_id():
     case.confirmationDate = date(2022, 6, 13)
     case.caseReference = ref
     case.caseStatus = "probable"
+    case.pathogenStatus = "unknown"
     csv = case.to_csv()
-    assert csv == f"{id1},probable,2022-06-13,{id2},,,,,,\r\n"
+    assert csv == f"{id1},probable,unknown,2022-06-13,{id2},,,,,,\r\n"
 
 
 def test_apply_update_to_case():