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Cyclic threshold (Ct) value of collected samples with culture tests at time point after symptom onset in (A) nasopharyngeal, (B) sputum samples. Negative and positive mean culture-negative and culture-positive, respectively. The dashed lines indicate the general time of releasing COVID-19 patients who are not seriously ill, the solid circles show the latest presence of the viable Delta variant, and the dotted circles represent the latest presence of the viable original virus.
