An article published in Clinical Infectious Diseases reported patients with Ct > 25 could not be contagious.
Jaafar, R. et al. Correlation Between 3790 Quantitative Polymerase Chain Reaction–Positives Samples and Positive Cell Cultures, Including 1941 Severe Acute Respiratory Syndrome Coronavirus 2 Isolates. Clin. Infect. Dis. (2020) doi:10.1093/cid/ciaa1491.
PCT Test with Ct 25 or More, Not Contagious
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