PCR test with a cycle threshold above 35 is too sensitive – Juliet Morrison, a virologist at the University of California, Riverside. “I’m shocked that people would think that 40 could represent a positive,” she said. A more reasonable cutoff would be 30 to 35, she added.
The PCR test should be set at 30, or even less – Dr. Michael Mina, an epidemiologist at the Harvard T.H.
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