Add three papers on immunity.

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diff --git a/covid19-links.md b/covid19-links.md
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@@ -87,6 +87,36 @@
 
 ## Topical or time-specific links: ##
 
+* [Robust T cell immunity in convalescent individuals with
+  asymptomatic or mild
+  COVID-19](https://www.biorxiv.org/content/10.1101/2020.06.29.174888v1)
+  (2020-06-29 preprint).  Key finding: “Our collective dataset shows
+  that SARS-CoV-2 elicits robust memory T cell responses akin to those
+  observed in the context of successful vaccines, suggesting that
+  natural exposure or infection may prevent recurrent episodes of
+  severe COVID-19 also in seronegative individuals.”
+
+* [Intrafamilial Exposure to SARS-CoV-2 Induces Cellular Immune
+  Response without
+  Seroconversion](https://www.medrxiv.org/content/10.1101/2020.06.21.20132449v1)
+  (2020-06-20 preprint).  Conclusion: “Exposure to SARS-CoV-2 can
+  induce virus-specific T cell responses without seroconversion.  T
+  cell responses may be more sensitive indicators of SARS-Co-V-2
+  exposure than antibodies.  Our results indicate that epidemiological
+  data relying only on the detection of SARS-CoV-2 antibodies may lead
+  to a substantial underestimation of prior exposure to the virus.”
+
+* [Systemic and mucosal antibody secretion specific to SARS-CoV-2
+  during mild versus severe
+  COVID-19](https://www.biorxiv.org/content/10.1101/2020.05.21.108308v1)
+  (2020-05-23 preprint).  Main conclusion: “Data show that systemic
+  IgA and IgG production against SARS-CoV-2 develops mainly in severe
+  COVID-19, with very high IgA levels seen in patients with severe
+  ARDS, whereas mild disease may be associated with transient serum
+  titers of SARS-CoV-2-specific antibodies but stimulate mucosal
+  SARS-CoV-2-specific IgA secretion.  The findings suggest four grades
+  of antibody responses dependent on COVID-19 severity.”
+
 \[Note that around the end of May I stopped maintaining this list.
 Still adding a few papers later, but it's definitely less complete
 than it used to be.\]