Hong Kong has started a required two-week quarantine for every person who returns from the coronavirus-struck Wuhan city of China.
Returnees have to stay isolated in hotel rooms or government-run centres. If anyone found violating the new rules, they will have to face a fine and a prison sentence, reports BBC.
Tens of thousands of travellers queued at the Chinese border city of Shenzhen to beat the Friday midnight deadline.
Hong Kong has seen 26 confirmed cases of the virus and one person has died.
The number of confirmed cases in mainland China stands at 34,546, with 722 deaths. The World Health Organization (WHO) also released new data from 17,000 patients that suggested 82% had a mild form of the disease, with 15% considered severe cases and 3% critical.