diff --git a/functests/toulouse_maelis/data/test_update_child_doctor.json b/functests/toulouse_maelis/data/test_update_child_doctor.json
new file mode 100644
index 00000000..fa2d229f
--- /dev/null
+++ b/functests/toulouse_maelis/data/test_update_child_doctor.json
@@ -0,0 +1,31 @@
+{
+  "familyDoctor": {
+    "name": "HIBBERT",
+    "phone": "0656785678",
+    "address": {
+      "street1": "General Hospital",
+      "zipcode": "90701",
+      "town": "Springfield"
+    }
+  },
+  "allergy1": null,
+  "allergy2": null,
+  "comment1": null,
+  "comment2": null,
+  "observ1": null,
+  "observ2": null,
+  "isAuthHospital": true,
+  "hospital": "Springfield General Hospital",
+  "vaccinList": [
+    {
+      "code": "1",
+      "libelle": "TETANOS",
+      "vaccinationDate": "2022-02-22T00:00:00+01:00"
+    },
+    {
+      "code": "8",
+      "libelle": "DTPOLIO",
+      "vaccinationDate": "2011-01-11T00:00:00+01:00"
+    }
+  ]
+}
diff --git a/functests/toulouse_maelis/test_02_family.py b/functests/toulouse_maelis/test_02_family.py
index d0686aaa..fa2a502f 100644
--- a/functests/toulouse_maelis/test_02_family.py
+++ b/functests/toulouse_maelis/test_02_family.py
@@ -618,6 +618,24 @@ def test_update_child_medical_record(conn, update_data):
         update_data['bart_num'],
     )
 
+    # update only doctor
+    # #2720: allergies comments, and observations are erased
+    payload = {
+        'familyDoctor': {
+            'name': 'Hibbert',
+            'phone': '0656785678',
+            'address': {
+                'street1': 'General Hospital',
+                'zipcode': '90701',
+                'town': 'Springfield',
+            },
+        },
+    }
+    resp = requests.post(url, json=payload)
+    resp.raise_for_status()
+    assert resp.json()['err'] == 0
+    assert diff_child(conn, update_data['name_id'], 0, 'test_update_child_doctor.json', key='medicalRecord')
+
     # reset medical record
     payload = FAMILY_RESET_PAYLOAD['childList'][0]['medicalRecord']
     resp = requests.post(url, json=payload)