Focus on case numbers by means of PCR tests is problematic because a PCR test only measures virus RNA, not the cause of sickness or contagiousness. If a thousa

Focus on case numbers by means of PCR tests is problematic because a PCR test only measures virus RNA, not the cause of sickness or contagiousness. If a thousand healthy people come in contact with the virus it is possible they all will have a positive PCR test while not being contagious at the same time.