diff --git a/covid19-etl/etl/ds4c.py b/covid19-etl/etl/ds4c.py
index 7bc82c88..7398edfc 100644
--- a/covid19-etl/etl/ds4c.py
+++ b/covid19-etl/etl/ds4c.py
@@ -10,7 +10,7 @@
 
 
 def harmonize_gender(gender):
-    {"male": "Male", "female": "Female", "": "Not reported"}[gender]
+    return {"male": "Male", "female": "Female", "": "Not reported"}[gender]
 
 
 class DS4C(base.BaseETL):
diff --git a/covid19-etl/etl/dsci.py b/covid19-etl/etl/dsci.py
index cf251dff..722bad98 100644
--- a/covid19-etl/etl/dsci.py
+++ b/covid19-etl/etl/dsci.py
@@ -11,7 +11,7 @@
 
 
 def harmonize_gender(gender):
-    {"male": "Male", "female": "Female", "": "Not reported"}[gender]
+    return {"male": "Male", "female": "Female", "": "Not reported"}[gender]
 
 
 def format_date(date):
diff --git a/covid19-etl/etl/idph.py b/covid19-etl/etl/idph.py
index a0e31035..df625b06 100644
--- a/covid19-etl/etl/idph.py
+++ b/covid19-etl/etl/idph.py
@@ -1,6 +1,5 @@
 import datetime
 import os
-import re
 from contextlib import closing
 
 import requests
diff --git a/covid19-etl/etl/idph_zipcode.py b/covid19-etl/etl/idph_zipcode.py
index 8b2b9a09..04b0dff7 100644
--- a/covid19-etl/etl/idph_zipcode.py
+++ b/covid19-etl/etl/idph_zipcode.py
@@ -1,6 +1,5 @@
 from contextlib import closing
 import datetime
-import re
 import requests
 
 from etl import base
diff --git a/covid19-etl/etl/jhu.py b/covid19-etl/etl/jhu.py
index ddd4577f..c12c9e15 100644
--- a/covid19-etl/etl/jhu.py
+++ b/covid19-etl/etl/jhu.py
@@ -42,7 +42,7 @@ def format_summary_clinical_submitter_id(location_submitter_id, date):
     return "{}_{}".format(sub_id, date)
 
 
-def format_time_series_date(date):
+def time_series_date_to_string(date):
     return datetime.strptime(date, "%Y-%m-%d").isoformat("T")
 
 
@@ -128,7 +128,10 @@ def __init__(self, base_url, access_token, s3_bucket):
                 },
             },
         }
-        self.existing_data = self.metadata_helper.get_existing_data_jhu()
+        (
+            self.existing_summary_locations,
+            self.last_date,
+        ) = self.metadata_helper.get_existing_data_jhu()
 
     def files_to_submissions(self):
         """
@@ -198,17 +201,16 @@ def parse_file(self, file_type, data_type, url):
                 if (
                     location_submitter_id not in self.location_data
                     # do not re-submit location data that already exist
-                    and location_submitter_id not in self.existing_data
+                    and location_submitter_id not in self.existing_summary_locations
                 ):
                     self.location_data[location_submitter_id] = location
 
                 for date, value in date_to_value.items():
-                    date_submitter_id = format_summary_clinical_submitter_id(
-                        location_submitter_id, date
-                    )
-                    # do not re-submit time_series data that already exist
-                    if date_submitter_id not in self.existing_data.get(
-                        location_submitter_id, []
+                    # do not re-submit summary_clinical data that
+                    # already exist. Assume anything older than the last
+                    # submitted date has already been submitted
+                    if time_series_date_to_string(date) > time_series_date_to_string(
+                        self.last_date
                     ):
                         self.time_series_data[location_submitter_id][date][
                             data_type
@@ -304,7 +306,6 @@ def submit_metadata(self):
         `self.location_data already contains Sheepdog records. Batch submits
         all records in `self.location_data` and `self.time_series_data`
         """
-
         print("Submitting summary_location data")
         for location in self.location_data.values():
             record = {"type": "summary_location"}
@@ -322,7 +323,7 @@ def submit_metadata(self):
                     "type": "summary_clinical",
                     "submitter_id": submitter_id,
                     "summary_locations": [{"submitter_id": location_submitter_id}],
-                    "date": format_time_series_date(date),
+                    "date": time_series_date_to_string(date),
                 }
                 for data_type, value in data.items():
                     record[data_type] = value
diff --git a/covid19-etl/etl/jhu_country_codes.py b/covid19-etl/etl/jhu_country_codes.py
index f7a2e6e5..71f743f3 100644
--- a/covid19-etl/etl/jhu_country_codes.py
+++ b/covid19-etl/etl/jhu_country_codes.py
@@ -1,9 +1,6 @@
 # This only needs to be run once, when new locations are submitted.
 # The country data was obtained from https://datahub.io/core/country-codes.
 
-import json
-import requests
-
 from etl import base
 from utils.metadata_helper import MetadataHelper
 from utils.country_codes_utils import get_codes_dictionary, get_codes_for_country_name
diff --git a/covid19-etl/etl/jhu_to_s3.py b/covid19-etl/etl/jhu_to_s3.py
index 68bfadec..91a13aca 100644
--- a/covid19-etl/etl/jhu_to_s3.py
+++ b/covid19-etl/etl/jhu_to_s3.py
@@ -7,7 +7,6 @@
 import json
 import os
 import pathlib
-import re
 import requests
 import time
 
diff --git a/covid19-etl/etl/vac_tracker.py b/covid19-etl/etl/vac_tracker.py
index 3929f0c3..16376b5d 100644
--- a/covid19-etl/etl/vac_tracker.py
+++ b/covid19-etl/etl/vac_tracker.py
@@ -1,5 +1,3 @@
-import csv
-import re
 from contextlib import closing
 
 import requests
diff --git a/covid19-etl/utils/async_file_helper.py b/covid19-etl/utils/async_file_helper.py
index 0f3ac075..3a1ba625 100644
--- a/covid19-etl/utils/async_file_helper.py
+++ b/covid19-etl/utils/async_file_helper.py
@@ -70,7 +70,6 @@ async def _async_upload_file(path, url):
                 async with ClientSession() as session:
                     async with session.put(url, data=data) as r:
                         return r.status
-                return None
 
         basename = path.name
         presigned_url, guid = await self.async_get_presigned_url(basename)
diff --git a/covid19-etl/utils/format_helper.py b/covid19-etl/utils/format_helper.py
index b8d318a9..640bafcb 100644
--- a/covid19-etl/utils/format_helper.py
+++ b/covid19-etl/utils/format_helper.py
@@ -16,7 +16,8 @@ def format_submitter_id(node, args):
     """
     submitter_id = node
     for v in args.values():
-        submitter_id += "_{}".format(v)
+        if v:
+            submitter_id += "_{}".format(v)
 
     submitter_id = submitter_id.lower()
     submitter_id = re.sub("[^a-z0-9-_]+", "-", submitter_id)
diff --git a/covid19-etl/utils/metadata_helper.py b/covid19-etl/utils/metadata_helper.py
index 5ce2cbbf..005f4f08 100644
--- a/covid19-etl/utils/metadata_helper.py
+++ b/covid19-etl/utils/metadata_helper.py
@@ -26,77 +26,54 @@ def __init__(self, base_url, program_name, project_code, access_token):
 
     def get_existing_data_jhu(self):
         """
-        Queries Peregrine for the existing `location` and `time_series` data. Returns a dict in format { "location1": [ "date1", "date2" ] }
-        """
-        print("Getting existing data from Peregrine...")
-        print("  summary_location data...")
-        query_string = (
-            '{ summary_location (first: 0, project_id: "'
-            + self.project_id
-            + '") { submitter_id } }'
+        Queries Guppy for the existing `summary_location` and
+        `summary_clinical` data. Returns the list of all the existing
+        summary_location submitter_ids, and the latest submitted date
+        as a string:
+        (
+            [
+                "summary_location_submitter_id1",
+                "summary_location_submitter_id2",
+                ...
+            ],
+            "2020-11-02"
         )
-        query_res = self.query_peregrine(query_string)
-        json_res = {
-            location["submitter_id"]: []
-            for location in query_res["data"]["summary_location"]
-        }
-
-        print("  summary_clinical data...")
-
-        summary_clinicals = []
-        data = None
-        offset = 0
-        first = 50000
-        max_retries = 3
-        while data != []:  # don't change, it explicitly checks for empty list
-            tries = 0
-            while tries < max_retries:
-                print(
-                    "    Getting first {} records with offset: {}".format(first, offset)
-                )
-                query_string = (
-                    "{ summary_clinical (first: "
-                    + str(first)
-                    + ", offset: "
-                    + str(offset)
-                    + ', project_id: "'
-                    + self.project_id
-                    + '") { submitter_id } }'
-                )
-
-                query_res = None
-                try:
-                    query_res = self.query_peregrine(query_string)
-                except:
-                    print(f"Peregrine did not return JSON: {response.text}")
+        """
+        _filter = {"=": {"project_id": self.project_id}}
 
-                if query_res:
-                    data = query_res["data"]["summary_clinical"]
-                    summary_clinicals.extend(data)
-                    offset += first
-                    break
-                else:
-                    tries += 1
-                    print("    Trying again (#{})".format(tries))
-                    sleep(2)  # wait 2 seconds - can change to exponential backoff later
-            assert (
-                tries < max_retries
-            ), "    Unable to query Peregrine for existing 'summary_clinical' data"
+        print("Getting existing summary_location submitter_ids from Guppy...")
+        res = self.download_from_guppy("location", ["submitter_id"], _filter)
+        summary_locations = [r["submitter_id"] for r in res]
 
-        for sc in summary_clinicals:
-            sc_id = sc["submitter_id"]
-            location_id = sc_id.replace("summary_clinical", "summary_location")
-            location_id = "_".join(location_id.split("_")[:-1])  # remove the date
-            json_res[location_id].append(sc_id)
+        print("Getting the latest summary_clinical date from Guppy...")
+        query_string = """query ($filter: JSON) {
+            location (
+                filter: $filter,
+                sort: [{date: "desc"}],
+                first: 1,
+                accessibility: accessible
+            ) {
+                date
+            }
+        }"""
+        variables = {"filter": _filter}
+        query_res = self.query_guppy(query_string, variables)
+        if not query_res["data"]["location"]:
+            raise Exception(
+                "Did not receive any data from Guppy. Is the token expired?"
+            )
+        loc = query_res["data"]["location"][0]
+        # from format: %Y-%m-%dT00:00:00
+        latest_submitted_date = loc["date"].split("T")[0]
 
-        return json_res
+        return summary_locations, latest_submitted_date
 
     def get_latest_submitted_date_idph(self):
         """
         Queries Guppy for the existing `location` data.
         Returns the latest submitted date as Python "datetime.date"
         """
-        print("Getting the latest date from Guppy...")
+        print("Getting the latest summary_clinical date from Guppy...")
         query_string = """query ($filter: JSON) {
             location (
                 filter: $filter,
@@ -224,3 +201,27 @@ def query_guppy(self, query_string, variables=None):
         except:
             print(f"Guppy did not return JSON: {response.text}")
             raise
+
+    def download_from_guppy(self, _type, fields=None, filter=None):
+        body = {"type": _type, "accessibility": "accessible"}
+        if fields:
+            body["fields"] = fields
+        if filter:
+            body["filter"] = filter
+
+        url = f"{self.base_url}/guppy/download"
+        response = requests.post(
+            url,
+            json=body,
+            headers=self.headers,
+        )
+        try:
+            response.raise_for_status()
+        except Exception:
+            print(f"Unable to download from Guppy.\nBody: {body}")
+            raise
+        try:
+            return response.json()
+        except:
+            print(f"Guppy did not return JSON: {response.text}")
+            raise
diff --git a/covid19-notebooks/dashboard_charts/generate_plots.py b/covid19-notebooks/dashboard_charts/generate_plots.py
index abe8b635..a3169690 100644
--- a/covid19-notebooks/dashboard_charts/generate_plots.py
+++ b/covid19-notebooks/dashboard_charts/generate_plots.py
@@ -1,11 +1,6 @@
-import numpy as np
 import pandas as pd
-import matplotlib.pyplot as plt
-import seaborn as sns
-import gen3
 from gen3.auth import Gen3Auth
 from gen3.submission import Gen3Submission
-import itertools
 from itertools import islice
 from collections import deque
 import plotly.graph_objects as go
@@ -17,7 +12,6 @@
 data_day = (
     raw_data_confirmed.groupby(["Country/Region"]).sum().drop(["Lat", "Long"], axis=1)
 )
-df = data_day.transpose()
 data = data_day.reset_index().melt(id_vars="Country/Region", var_name="date")
 
 # Pivot data to wide & index by date
diff --git a/covid19-notebooks/generate_top10_plots.py b/covid19-notebooks/generate_top10_plots.py
index dc502a64..6bc50743 100644
--- a/covid19-notebooks/generate_top10_plots.py
+++ b/covid19-notebooks/generate_top10_plots.py
@@ -1,6 +1,4 @@
-import numpy as np
 import pandas as pd
-import itertools
 from itertools import islice
 from collections import deque
 
@@ -10,7 +8,6 @@
 data_day = (
     raw_data_confirmed.groupby(["Country/Region"]).sum().drop(["Lat", "Long"], axis=1)
 )
-df = data_day.transpose()
 data = data_day.reset_index().melt(id_vars="Country/Region", var_name="date")
 
 # Pivot data to wide & index by date