diff --git a/src/DataFrameNormalizer.py b/src/DataFrameNormalizer.py
index 699d8ba7c82..2dd3d056a5a 100644
--- a/src/DataFrameNormalizer.py
+++ b/src/DataFrameNormalizer.py
@@ -2,14 +2,6 @@ import numpy as np
 
 class DataFrameNormalizer:
     
-    @staticmethod
-    def normalize(dataFrame):
-        DataFrameNormalizer.removeUnknownBatchCodes(dataFrame)
-        DataFrameNormalizer.convertVAX_LOTColumnToUpperCase(dataFrame)
-        DataFrameNormalizer._convertColumnsOfDataFrame_Y_to_1_else_0(
-            dataFrame,
-            ['DIED', 'L_THREAT', 'DISABLE', 'HOSPITAL', 'ER_VISIT'])
-
     @staticmethod
     def convertVAX_LOTColumnToUpperCase(dataFrame):
         dataFrame['VAX_LOT'] = dataFrame['VAX_LOT'].str.upper()
diff --git a/src/VaersDescrReader.py b/src/VaersDescrReader.py
index 99e541f1743..08002999477 100644
--- a/src/VaersDescrReader.py
+++ b/src/VaersDescrReader.py
@@ -25,11 +25,15 @@ class VaersDescrReader:
                }
 
     def _readVAERSDATA(self, file):
-        return self._read_csv(
+        VAERSDATA = self._read_csv(
             file = file,
             usecols = ['VAERS_ID', 'RECVDATE', 'DIED', 'L_THREAT', 'DISABLE', 'HOSPITAL', 'ER_VISIT', 'SPLTTYPE'],
             parse_dates = ['RECVDATE'],
             date_parser = lambda dateStr: pd.to_datetime(dateStr, format = "%m/%d/%Y"))
+        DataFrameNormalizer._convertColumnsOfDataFrame_Y_to_1_else_0(
+            VAERSDATA,
+            ['DIED', 'L_THREAT', 'DISABLE', 'HOSPITAL', 'ER_VISIT'])
+        return VAERSDATA
 
     def _readVAERSVAX(self, file):
         VAERSVAX = self._read_csv(
@@ -40,6 +44,7 @@ class VaersDescrReader:
                     "VAX_DOSE_SERIES": "string",
                     "VAX_LOT": "string"
                 })
+        DataFrameNormalizer.removeUnknownBatchCodes(VAERSVAX)
         DataFrameNormalizer.convertVAX_LOTColumnToUpperCase(VAERSVAX)
         return VAERSVAX
 
diff --git a/src/VaersDescrReaderTest.py b/src/VaersDescrReaderTest.py
index 98c535f6651..dbba3397024 100644
--- a/src/VaersDescrReaderTest.py
+++ b/src/VaersDescrReaderTest.py
@@ -19,7 +19,7 @@ class VaersDescrReaderTest(unittest.TestCase):
                 vaersDescr['VAERSDATA'],
                 TestHelper.createDataFrame(
                     columns = ['RECVDATE',                                          'DIED', 'L_THREAT', 'ER_VISIT', 'HOSPITAL', 'DISABLE', 'SPLTTYPE'],
-                    data = [  [pd.to_datetime('01/01/2023', format = "%m/%d/%Y"),   np.nan,  np.nan,    np.nan,     np.nan,     np.nan,    np.nan]],
+                    data = [  [pd.to_datetime('01/01/2023', format = "%m/%d/%Y"),   0,      0,          0,          0,          0,         np.nan]],
                     index = pd.Index(
                             name = 'VAERS_ID',
                             data = [2547730])))
diff --git a/src/VaersReader.py b/src/VaersReader.py
index 94e71bcd4ed..a8537f5a82f 100644
--- a/src/VaersReader.py
+++ b/src/VaersReader.py
@@ -1,7 +1,6 @@
 from CountryColumnAdder import CountryColumnAdder
 from VaersDescrReader import VaersDescrReader
 from VaersDescr2DataFrameConverter import VaersDescr2DataFrameConverter
-from DataFrameNormalizer import DataFrameNormalizer
 from SevereColumnAdder import SevereColumnAdder
 
 def getVaersForYears(years):
@@ -24,6 +23,5 @@ def _getVaersDescrReader():
 def _getVaers(vaersDescrs, addCountryColumn):
     dataFrame = VaersDescr2DataFrameConverter.createDataFrameFromDescrs(vaersDescrs)
     dataFrame = addCountryColumn(dataFrame)
-    DataFrameNormalizer.normalize(dataFrame)
     dataFrame = SevereColumnAdder.addSevereColumn(dataFrame)
     return dataFrame
\ No newline at end of file
diff --git a/src/testdata/2023VAERSVAX.csv b/src/testdata/2023VAERSVAX.csv
index f69bfff3a1f..fc3b36e29ee 100644
--- a/src/testdata/2023VAERSVAX.csv
+++ b/src/testdata/2023VAERSVAX.csv
@@ -1,3 +1,4 @@
 VAERS_ID,VAX_TYPE,VAX_MANU,VAX_LOT,VAX_DOSE_SERIES,VAX_ROUTE,VAX_SITE,VAX_NAME
 2547730,COVID19,JANSSEN,1808982,UNK,SYR,AR,COVID19 (COVID19 (JANSSEN))
-2547730,COVID19,PFIZER\BIONTECH,EW0175,1,IM,,COVID19 (COVID19 (PFIZER-BIONTECH))
+2547730,COVID19,PFIZER\BIONTECH,ew0175,1,IM,,COVID19 (COVID19 (PFIZER-BIONTECH))
+2547731,COVID19,PFIZER\BIONTECH,UNKNOWN TO ME,1,IM,,COVID19 (COVID19 (PFIZER-BIONTECH))