From 4318af6399aef26150d464e386da2ae71238ed62 Mon Sep 17 00:00:00 2001
From: "David A. Madore" <david+git@madore.org>
Date: Fri, 20 Mar 2020 14:22:12 +0100
Subject: Thread about immunity.

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

diff --git a/covid19-links.md b/covid19-links.md
index 8d9fdb6..5484d58 100644
--- a/covid19-links.md
+++ b/covid19-links.md
@@ -60,6 +60,10 @@
 
 ## Topical or time-specific links: ##
 
+* [A thread about immunity by Nicholas
+  A. Christakis](https://threadreaderapp.com/thread/1240689935557865472.html)
+  (2020-03-20) explaining what we now know and don't know.
+
 * [A thread about
   favipiravir](https://threadreaderapp.com/thread/1240261123712126978.html)
   (2020-03-18) as a possible treatment of Covid-19.
-- 
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