TL;DR: Some (many?) PCR tests are using too high a cycle threshold, which makes them too sensitive. Key quote:
Juliet Morrison, a virologist at the University of California-Riverside, said she believes any test with a cycle threshold over 35 is too sensitive. "I'm shocked that people would think that 40 could represent a positive," she said.
The following is my commentary, and not specifically in the article above:
There were many early tests that were giving false negatives. It looks to me like test manufactures over-compensated to make sure they never give false negatives. There is no data source that I can find that shows what test is used in what area, or what CT is used for what test.
TL;DR: Some (many?) PCR tests are using too high a cycle threshold, which makes them too sensitive. Key quote:
Juliet Morrison, a virologist at the University of California-Riverside, said she believes any test with a cycle threshold over 35 is too sensitive. "I'm shocked that people would think that 40 could represent a positive," she said.
The following is my commentary, and not specifically in the article above:
There were many early tests that were giving false negatives. It looks to me like test manufactures over-compensated to make sure they never give false negatives. There is no data source that I can find that shows what test is used in what area, or what CT is used for what test.