A: With serological (aka blood) testing, we can learn: (1) The true scope of COVID spread; (2) Who exhibits immunity; (3) How to best develop (promising!) blood-based treatments from COVID survivors.
Links:

A: With serological (aka blood) testing, we can learn: (1) The true scope of COVID spread; (2) Who exhibits immunity; (3) How to best develop (promising!) blood-based treatments from COVID survivors.
Links: