Antibody tests need to be in place for 2nd coronavirus wave, CDC director says

The head of the CDC, Dr. Robert Redfield says that serological Covid-19 rapid tests are different from the diagnostic tests used to determine whether a person is sick with the virus. Instead, the tests look for the antibodies in a person's blood that the immune system makes in response to an infection.

The population testing will give a much more accurate understanding of the symptomatic vs. asymptomatic ratio, and will give a much better understanding of the mortality, once we see the full extent. Also, it can be useful in defining high-risk populations that are conceptually immune.