diff --git a/docs/SymptomsCausedByCOVIDLots/index.html b/docs/SymptomsCausedByCOVIDLots/index.html
index 5b2015cb1f9..51e5de54172 100644
--- a/docs/SymptomsCausedByCOVIDLots/index.html
+++ b/docs/SymptomsCausedByCOVIDLots/index.html
@@ -13835,12 +13835,12 @@
             <div class="col-xs-12 col-sm-6">
               <div class="x_panel">
                 <div class="x_title">
-                  <h3>Comparison of the PRRs of two Symptoms</h3>
+                  <h3>Comparison of PRRs of two Symptoms</h3>
                   <div class="clearfix"></div>
                 </div>
                 <div class="x_content">
                   <div style="margin-bottom: 20px;">
-                    <label>Select Symptom for X axis:</label>
+                    <label>Symptom for X axis:</label>
                     <select id="symptomSelectX" name="symptom">
                       <option disabled="" hidden="" selected="" value="">Select Symptom</option>
                       <option value="17-hydroxyprogesterone">17-hydroxyprogesterone</option>
@@ -27015,7 +27015,7 @@
                     </select>
                   </div>
                   <div style="margin-bottom: 20px;">
-                    <label>Select Symptom for Y axis:</label>
+                    <label>Symptom for Y axis:</label>
                     <select id="symptomSelectY" name="symptom">
                       <option disabled="" hidden="" selected="" value="">Select Symptom</option>
                       <option value="17-hydroxyprogesterone">17-hydroxyprogesterone</option>
diff --git a/docs/SymptomsCausedByCOVIDLots/js/PageInitializer.js b/docs/SymptomsCausedByCOVIDLots/js/PageInitializer.js
index 1151815f971..b1a84a106de 100644
--- a/docs/SymptomsCausedByCOVIDLots/js/PageInitializer.js
+++ b/docs/SymptomsCausedByCOVIDLots/js/PageInitializer.js
@@ -1,8 +1,8 @@
 class PageInitializer {
 
     static #symptomVsSymptomChartView;
-    static #symptomX = 'Immunosuppression';
-    static #symptomY = 'Immunoglobulin therapy';
+    static #symptomX = null;
+    static #symptomY = null;
 
     static initializePage({ symptom, vaccine, symptomVsSymptomChart }) {
         PageInitializer.#configureSymptom(symptom);
@@ -37,7 +37,7 @@ class PageInitializer {
                 selectElement: symptomSelectXElement,
                 onValueSelected: symptomX => {
                     PageInitializer.#symptomX = symptomX;
-                    PageInitializer.#symptomVsSymptomChartView.loadAndDisplayChart(PageInitializer.#symptomX, PageInitializer.#symptomY);
+                    PageInitializer.#loadAndDisplayChart();
                 },
                 minimumInputLength: 4
             });
@@ -46,11 +46,11 @@ class PageInitializer {
                 selectElement: symptomSelectYElement,
                 onValueSelected: symptomY => {
                     PageInitializer.#symptomY = symptomY;
-                    PageInitializer.#symptomVsSymptomChartView.loadAndDisplayChart(PageInitializer.#symptomX, PageInitializer.#symptomY);
+                    PageInitializer.#loadAndDisplayChart();
                 },
                 minimumInputLength: 4
             });
-        PageInitializer.#symptomVsSymptomChartView.loadAndDisplayChart(PageInitializer.#symptomX, PageInitializer.#symptomY);
+        PageInitializer.#loadAndDisplayChart();
     }
 
     static #initializeSelectElement({ selectElement, onValueSelected, minimumInputLength }) {
@@ -62,4 +62,12 @@ class PageInitializer {
                 onValueSelected(value);
             });
     }
+
+    static #loadAndDisplayChart() {
+        if (PageInitializer.#symptomX != null && PageInitializer.#symptomY != null) {
+            PageInitializer.#symptomVsSymptomChartView.loadAndDisplayChart(
+                PageInitializer.#symptomX,
+                PageInitializer.#symptomY);
+        }
+    }
 }