PCR検査で陽性（陰性）の

PCR positive (negative)

Abdominal pain and gastrointestinal symptoms have been a common feature, as has cardiac inflammation. This has been observed in children with confirmed PCR positive Sars-CoV-2 infection as well as children who are PCR negative.
https://www.theguardian.com/world/2020/apr/27/nhs-...