The thing is though, the current PCR-based tests can be parallelised, with hundreds being run at the same time, taking just a couple of hours.

The biggest waiting time comes from logistics with transportation to the labs, which is where the Bosch test is advantageous.

> With the tests currently in use, patients must usually wait one to two days for a result.

Is that because it takes 2 days for the test to complete, or because there a 2 day delay from backlog + administrative time?

How does that help? Which results are you going to treat with low confidence for second pass and why? Positives? Negatives? Both? If both, then what's the point of first pass anyway?

That approach makes sense for when you want a low false positive rate, i.e. when the treatment is dangerous or expensive (so you want to avoid it at all costs if it's unnecessary). Here, it's the other way around. Treatment is benign (stay at home unless it becomes an emergency), but a false negative is expensive (you'd infect lots of others). What cheap test do you know that can have a low false negative rate? The only one I know is the one that flags everyone as infected.