[NobleFree]

Boston’s Pine Street Inn - essentially a homeless shelter for street bums - test 146 residents and all 146 residents tested positive. All were asymptomatic. This implies that at the 95% confidence level, survival rates are close to 98%. The chances of tossing 146 heads in 146 tries with coin that comes up heads 98% of the time is only 5.2%.

Not a random sample, so cannot reliably be extrapolated to the larger population.

[Lonesome in Massachussets]

Not a random sample, not a controlled experiment, but evidence nonetheless. You have a large “vulnerable” population and every single individual was infected and remained asymptomatic.

This is not the Spanish Flu.