IIRC the Dutch government tests for SARS-CoV-2 DNA in the test samples, which are gathered from the sinus cavity. I would expect that China uses a similar test.
The presence of the virus' DNA would indicate the presence of the virus itself.
It's telling that the infected first test positive, then at some point during their recovery do not, and then later do test positive again.
The presence of the virus' DNA would indicate the presence of the virus itself.
It's telling that the infected first test positive, then at some point during their recovery do not, and then later do test positive again.