WHO over PCR-test voor SARS-CoV 2003

Recommendations for testing for SARS-coronavirus, are very specific and mean that there is genetic material (RNA) of the SARS-CoV in the sample. This does not mean that there is live virus present, or that it is present in a quantity large enough to infect another person.

https://www.who.int/csr/sars/diagnostictests/en/