COVID-19
Blood type and Covid-19 infection: is there a link?
Archive (2021): early research suggested blood type might influence COVID-19 risk. A look at what those studies found — and why the link was never strong enough to act on.
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Diabetes as a common comorbidity of Covid-19 infection
Archive (2020): why diabetes was identified as a risk factor for severe COVID-19, the immune and metabolic mechanisms behind it, and what that meant for people with the condition.
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Archive (April 2020): how SARS-CoV-2 was identified, how coronaviruses spread, and how COVID-19 compared with SARS and MERS. Retained as a historical record.