The longitudinal (serial) assessment helps anchor that rate since 0-10% turned out to convert, with only 1 exception, the Kings County nursing facility
But it's also notable that "silent" infections may not be so silent after all
Can they transmit the infection to others?
The viral load of asymptomatic compared with symptomatic has consistently been shown to be similar in multiple studies
A v large, random sample to study this is needed
And physical distancing.
Consideration for eye protection, too, in light of the recent @TheLancet review
Resting heart rate should help detect people who are presymptomatic (HR ⬆️ before fever) and asymptomatic.
For more on this, our presentation this wk (starts at ~6 min)
has slides, references, ++