From 60696cd2091d7b9fdf3d4f9041678399bfa604a3 Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Thu, 16 Apr 2020 18:10:09 +0200
Subject: Link to my thread on problems in the definition of herd immunity.

---
 covid19-links.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/covid19-links.md b/covid19-links.md
index b8ebd80..9d53ef7 100644
--- a/covid19-links.md
+++ b/covid19-links.md
@@ -396,6 +396,10 @@
 
 ## My own explanatory threads on Twitter ##
 
+* [Problems with the definition of “herd
+  immunity”](https://threadreaderapp.com/thread/1250817310526525440.html)
+  (2020-04-16).
+
 * [The problem with using models to predict the
   future](https://threadreaderapp.com/thread/1249738327143501824.html)
   (2020-04-13).
-- 
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