Coronavirus Updates (May, part I): Interview with a vaccine trial participant, risk factors, "herd immunity" thresholds and serology.

For the masochists who apparently can't get enough content about
the coronavirus:

=> An interview with my friend who participated in the vaccine
trials
=> Some discussion of the risk factors that are associated
with deaths from COVID-19
=> Updated discussion of "herd immunity" thresholds and the
link between R0 and immunity fractions
=> Reports on serological testing that has taken place so
far.