> ability to test for residue (computer geek here, forgive my ignorance on biology) I came across the correct terminology recently. The tests that test if you

> ability to test for residue (computer geek here, forgive my ignorance on biology) I came across the correct terminology recently. The tests that test if you were infected within a certain time period, even if you did not have symptoms, are called serological tests. https://en.m.wikipedia.org/wiki/Serology https://en.m.wikipedia.org/wiki/Serology