From d3bcb60cd9e908f96b748cab2f496812a7b8437f Mon Sep 17 00:00:00 2001
From: Galen Guyer <galen@galenguyer.com>
Date: Wed, 18 Nov 2020 14:54:41 -0500
Subject: fix diff in prior positive test rate

---
 src/MainPage.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/MainPage.js b/src/MainPage.js
index 6ca3b04..c7e0721 100644
--- a/src/MainPage.js
+++ b/src/MainPage.js
@@ -121,7 +121,7 @@ const MainPage = (props) => {
                     <Card
                         name="Positive Test Rate"
                         latest={positiveTestRate + "%"}
-                        diff={priorPositiveTestRate + "%"}
+                        diff={positiveTestRate - priorPositiveTestRate + "%"}
                         link="/positivetests"
                     />
                 </div>
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