[dgacmu]

Because it's a CDC test in limited supply, and they're doing their best to try to balance the available supply with detecting as many cases as possible. The challenge is that the spread is changing rapidly enough that the guidelines will inevitably be a day or two behind periodically.

[takeda]

They are also banning hospitals from doing their own tests. All hospitals have equipment to test for virus presence. In fact we learned about first case of local virus spread, because a hospital ignored CDC and tested the suspected patient anyway.