diff --git a/ingest/defaults/config.yaml b/ingest/defaults/config.yaml
index bfadc56..8d491f3 100644
--- a/ingest/defaults/config.yaml
+++ b/ingest/defaults/config.yaml
@@ -112,6 +112,8 @@ curate:
     'location',
     'state',
     'host',
+    'host_genus',
+    'host_type',
     'is_lab_host',
     #'date_submitted',
     #'sra_accession',
diff --git a/ingest/defaults/host_hostgenus_hosttype_map.tsv b/ingest/defaults/host_hostgenus_hosttype_map.tsv
index a1d6b5e..f1edcb2 100644
--- a/ingest/defaults/host_hostgenus_hosttype_map.tsv
+++ b/ingest/defaults/host_hostgenus_hosttype_map.tsv
@@ -1,4 +1,4 @@
-"Host"	"Host_Genus"	"Host_Type"
+"host"	"host_genus"	"host_type"
 "Homo sapiens"	"Homo"	"Human"
 "Culex pipiens"	"Culex"	"Mosquito"
 "Culex annulirostris"	"Culex"	"Mosquito"
diff --git a/ingest/rules/curate.smk b/ingest/rules/curate.smk
index 77dc91a..da5b549 100644
--- a/ingest/rules/curate.smk
+++ b/ingest/rules/curate.smk
@@ -46,6 +46,7 @@ rule curate:
         sequences_ndjson="data/genbank.ndjson",
         all_geolocation_rules="data/all-geolocation-rules.tsv",
         annotations=config["curate"]["annotations"],
+        manual_mapping="defaults/host_hostgenus_hosttype_map.tsv",
     output:
         metadata="data/raw_metadata_curated.tsv",
         sequences="results/sequences.fasta",
@@ -98,6 +99,12 @@ rule curate:
             | ./scripts/post_process_metadata.py \
             | ./scripts/add-field-names \
                 --metadata-columns {params.metadata_columns} \
+            | ./scripts/transform-new-fields \
+                --map-tsv {input.manual_mapping} \
+                --map-id host \
+                --metadata-id host \
+                --map-fields host_genus host_type \
+                --pass-through true \
             | augur curate apply-record-annotations \
                 --annotations {input.annotations} \
                 --id-field {params.annotations_id} \
diff --git a/ingest/scripts/transform-new-fields b/ingest/scripts/transform-new-fields
new file mode 100755
index 0000000..a846990
--- /dev/null
+++ b/ingest/scripts/transform-new-fields
@@ -0,0 +1,50 @@
+#! /usr/bin/env python3
+
+import argparse
+import json
+import csv
+from sys import stdin, stdout
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description="Transform JSON data by applying a TSV mapping and adding new columns."
+    )
+    parser.add_argument("--map-tsv", required=True,
+        help="Path to the TSV mapping file.")
+    parser.add_argument("--map-id", required=True,
+        help="Column name in the map TSV to use as the mapping key.")
+    parser.add_argument("--metadata-id", required=True,
+        help="Column name in the metadata JSON to use as the mapping key.")
+    parser.add_argument("--map-fields", nargs="+", required=True,
+        help="Columns to add from the mapping file.")
+    parser.add_argument("--pass-through", default=False,
+        help="If set, pass through the original value when no mapping is found.")
+    return parser.parse_args()
+
+def load_mapping(map_tsv, map_id, map_fields):
+    mapping = {}
+    with open(map_tsv, 'r', encoding='utf-8') as f:
+        reader = csv.DictReader(f, delimiter='\t')
+        for row in reader:
+            key = row[map_id]
+            mapping[key] = {col: row[col] for col in map_fields}
+    return mapping
+
+def main():
+    args = parse_args()
+    mapping = load_mapping(args.map_tsv, args.map_id, args.map_fields)
+
+    for line in stdin:
+        record = json.loads(line)
+        key = record.get(args.metadata_id, '')
+
+        if key in mapping:
+            record.update(mapping[key])
+        elif args.pass_through:
+            for col in args.map_fields:
+                record[col] = record.get(args.metadata_id, '')
+
+        stdout.write(json.dumps(record) + '\n')
+
+if __name__ == "__main__":
+    main()