As COVID-19 has swept across the globe, it seems that high transmission rates have partly been driven by a large number of people catching the virus, not experiencing symptoms and then unknowingly passing it on. (excerpt)We know that the production of protective antibodies following an infection forms the basis of immunity. But while it's clear that infection with the coronavirus results in antibody production, we aren't sure of the amounts of antibodies produced, how long they last, or whether they protect people from getting COVID-19 again. (excerpt) To run our screening program, we used a lateral flow "pregnancy-like" test strip...