> antibody assays; this does not allow the screener to differentiate between "has COVID-19" and "had COVID-19"
It does if it's an IgM test - IgM is only around during the illness. However, it takes a while to come up, so it can't tell you if someone is presymptomatic, at which point they are highly infectious.
It does if it's an IgM test - IgM is only around during the illness. However, it takes a while to come up, so it can't tell you if someone is presymptomatic, at which point they are highly infectious.