Link two new papers on duration of immunity.

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 ## Topical or time-specific links: ##
 
+* [Humoral Immune Response to SARS-CoV-2 in
+  Iceland](https://www.nejm.org/doi/full/10.1056/NEJMoa2026116) (NEJM,
+  2020-10-29).  Conclusions: “Our results indicate that antiviral
+  antibodies against SARS-CoV-2 did not decline within 4 months after
+  diagnosis.  We estimate that the risk of death from infection was
+  0.3% and that 44% of persons infected with SARS-CoV-2 in Iceland
+  were not diagnosed by qPCR.”
+
+* [Robust neutralizing antibodies to SARS-CoV-2 infection persist for
+  months](https://science.sciencemag.org/content/early/2020/10/27/science.abd7728)
+  (*Science* report, 2020-10-28).  “We also show that titers are
+  relatively stable for at least a period approximating 5 months and
+  that anti-spike binding titers significantly correlate with
+  neutralization of authentic SARS-CoV-2.  Our data suggests that more
+  than 90% of seroconverters make detectible neutralizing antibody
+  responses.  These titers remain relatively stable for several months
+  after infection.”
+
 * [Virology, transmission, and pathogenesis of
   SARS-CoV-2](https://www.bmj.com/content/371/bmj.m3862) (*British
   Medical Journal* clinical update, 2020-10-23): an overview of what