Fig. 3.

Number of imported cases with Omicron and other SARS-CoV-2 variants identified in Hong Kong by day from arrival to isolation and day from arrival to symptom onset, and RT-PCR Ct-value at isolation of the imported cases by day from arrival to admission for isolation. Horizontal lines indicate RT-PCR Ct-value at 33 (samples with very low viral load, the criterion used for release of isolation during specific time periods) and 30 (samples with low viral load, indicating a possible re-positive result i.e., long-term intermittent shedding).