Here's an interesting announcement dated September 2, 2020, from the Houston (TX) Health Department about a new program to collect people's blood in order to test for COVID-19 antibodies. Health workers are going to randomly-selected homes unannounced and knocking on doors.... Houston's mayor is "strongly encouraging" people to participate.
Houston Health Department leading antibody testing survey to better understand the spread of COVID-19 in Houston
Houston Health Department leading antibody testing survey to better understand the spread of COVID-19 in Houston