I'm going to try to answer on all of those details, and Carol can jump in if I misspeak.
I don't think it's a clear analogy that 400,000 tests divided by two equals 200,000, because one individual may be missing both tests or only one test, so it could be a slightly different number than 200,000.
What we found through the data we analyzed was that there were 8,000 travellers who tested positive, and in the cases of just over 1,000 of those positive tests, the agency did not contact the travellers to inform them of those results.
Carol, did I get that right? She's nodding. There we go.