A new COVID-19 antibody blood test developed by Northwestern University scientists requires only a single drop of blood self-collected at home. It could generate estimates of herd immunity, measure vaccine effectiveness in the general population and model the course of future waves of infection. For the test, a person would use a fingerstick to collect their blood sample on filter paper and mail it to a lab for analysis. This method would allow for large-scale testing of neutralizing antibodies against COVID-19.
