Sometimes it takes few days time to detect. My friend test negative then after three days she tested again it was positive.
Yes it’s cortect it takes time. So it’s not ko PCR is not accurate. It is. Sometime amount of RNA, transportation, storage all can affect.
I think PCR conditions have been worked out fine for this virus. So it’s accuracy we other factors matters more.
I am saying it because I run all kinda PCR daily for other genes not covid