Link to two old papers which at least somewhat support the idea of dose-dependent severity.

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   admission.  Calcifediol seems to be able to reduce severity of the
   disease.”
 
+* [Inoculum at the time of SARS-CoV-2 exposure and risk of disease
+  severity](https://www.sciencedirect.com/science/article/pii/S1201971220304707)
+  (*J. Infect. Diseases*, 2020-08).  “We report three clusters of
+  individuals that were potentially exposed to distinct inoculum in
+  Madrid. […] Our data support that a greater viral inoculum at the
+  time of SARS-CoV-2 exposure might determine a higher risk of severe
+  COVID-19.”
+
 * [Feline coronavirus drug inhibits the main protease of SARS-CoV-2
   and blocks virus
   replication](https://www.nature.com/articles/s41467-020-18096-2)
@@ -248,6 +256,23 @@
   natural exposure or infection may prevent recurrent episodes of
   severe COVID-19 also in seronegative individuals.”
 
+* [Syrian hamsters as a small animal model for SARS-CoV-2 infection
+  and countermeasure
+  development](https://www.pnas.org/content/117/28/16587).  “We
+  assessed the replicative ability and pathogenesis of SARS-CoV-2
+  isolates in Syrian hamsters.  SARS-CoV-2 isolates replicated
+  efficiently in the lungs of hamsters, causing severe pathological
+  lung lesions following intranasal infection.  In addition,
+  microcomputed tomographic imaging revealed severe lung injury that
+  shared characteristics with SARS-CoV-2−infected human lung,
+  including severe, bilateral, peripherally distributed, multilobular
+  ground glass opacity, and regions of lung consolidation.
+  SARS-CoV-2−infected hamsters mounted neutralizing antibody responses
+  and were protected against subsequent rechallenge with
+  SARS-CoV-2. […] Collectively, these findings demonstrate that this
+  Syrian hamster model will be useful for understanding SARS-CoV-2
+  pathogenesis and testing vaccines and antiviral drugs.”
+
 * [Intrafamilial Exposure to SARS-CoV-2 Induces Cellular Immune
   Response without
   Seroconversion](https://www.medrxiv.org/content/10.1101/2020.06.21.20132449v1)