diff --git a/docs/SymptomsCausedByDrugs/js/PdfCreator.js b/docs/SymptomsCausedByDrugs/js/PdfCreator.js
index d5b49090611..f925ee6024f 100644
--- a/docs/SymptomsCausedByDrugs/js/PdfCreator.js
+++ b/docs/SymptomsCausedByDrugs/js/PdfCreator.js
@@ -1,14 +1,18 @@
 class PdfCreator {
 
-    static createPdf({ symptom, vaccine, heading, valueName }) {
-        const documentDefinition = {
+    static createPdf(pdf) {
+        return pdfMake.createPdf(PdfCreator.#createDocumentDefinition(pdf));
+    }
+
+    static #createDocumentDefinition({ symptom, vaccine, heading, valueName }) {
+        return {
             content: [
                 PdfCreator.#getPageHeading(heading),
                 ...PdfCreator.#getWorstDrugsSection(symptom, valueName),
-                ...PdfCreator.#getStrongestSymptomsSection(vaccine)
+                ...PdfCreator.#getStrongestSymptomsSection(vaccine),
+                PdfCreator.#link2Origin()
             ]
-        }
-        return pdfMake.createPdf(documentDefinition);
+        };
     }
 
     static #getPageHeading(heading) {
@@ -24,14 +28,14 @@ class PdfCreator {
     static #getWorstDrugsSection({ selectElement, table }, valueName) {
         return [
             PdfCreator.#getHeading(`Worst ${valueName} for "${PdfCreator.#getSelection(selectElement)}"`),
-            PdfCreator.#getTable(table)
+            PdfCreator.#getTable(table, true)
         ];
     }
 
     static #getStrongestSymptomsSection({ selectElement, table }) {
         return [
             PdfCreator.#getHeading(`Strongest Symptoms for "${PdfCreator.#getSelection(selectElement)}"`),
-            PdfCreator.#getTable(table)
+            PdfCreator.#getTable(table, false)
         ];
     }
 
@@ -49,17 +53,14 @@ class PdfCreator {
         return selectElement.select2('data')[0].text;
     }
 
-    // FK-TODO: add red background to some rows
-    static #getTable(table) {
-        const headers = PdfCreator.#getTableHeaders(table);
-        const rows = table.rows({ search: 'applied' }).data().toArray();
+    static #getTable(table, shallMarkRowsIfPrrTooHigh) {
         return {
             layout: 'lightHorizontalLines',
             table: {
                 headerRows: 1,
                 body: [
-                    headers,
-                    ...rows
+                    PdfCreator.#getTableHeaders(table),
+                    ...PdfCreator.#getMarkedRows(table, shallMarkRowsIfPrrTooHigh)
                 ]
             }
         };
@@ -75,4 +76,58 @@ class PdfCreator {
             }))
             .toArray();
     }
+
+    static #getMarkedRows(table, shallMarkRowsIfPrrTooHigh) {
+        const rows = PdfCreator.#getRows(table);
+        return shallMarkRowsIfPrrTooHigh ?
+            PdfCreator.#markRowsIfPrrTooHigh(rows) :
+            rows;
+    }
+
+    static #getRows(table) {
+        return table
+            .rows({ search: 'applied' })
+            .data()
+            .toArray();
+    }
+
+    static #markRowsIfPrrTooHigh(rows) {
+        return rows.map(PdfCreator.#markRowIfPrrTooHigh);
+    }
+
+    static #markRowIfPrrTooHigh(row) {
+        const prr = row[1];
+        return [
+            PdfCreator.#markValueIfPrrTooHigh({ value: row[0], prr: prr }),
+            PdfCreator.#markValueIfPrrTooHigh({ value: row[1], prr: prr })
+        ];
+    }
+
+    static #markValueIfPrrTooHigh({ value, prr }) {
+        return prr >= 2.0 ? PdfCreator.#markValue(value) : value;
+    }
+
+    static #markValue(value) {
+        return {
+            text: value,
+            fillColor: '#FF0000',
+            fillOpacity: 0.1,
+        };
+    }
+
+    static #link2Origin() {
+        return {
+            text:
+                [
+                    'Origin: ',
+                    {
+                        text: window.location.href,
+                        color: 'blue',
+                        decoration: 'underline',
+                        link: window.location.href
+                    }
+                ],
+            margin: [0, 10]
+        }
+    }
 }
\ No newline at end of file