Hong Kong has launched a mandatory two-week quarantine for anyone arriving from mainland China in an attempt to contain the new coronavirus.
Visitors must isolate themselves in hotel rooms or go to government-run centers, while residents returning to Hong Kong must stay in their homes.
Anyone who is caught ignoring the new rules faces a fine and a prison sentence.
Tens of thousands of travelers lined up in the Chinese border town of Shenzhen before the midnight deadline.
Hong Kong has seen 26 confirmed cases of viruses and one person has died. The number of confirmed cases in mainland China is 31,203, with 636 deaths.
Outside China, 270 cases have been confirmed in at least 25 countries, with another death: in the Philippines.
The nurse describes the “harrowing” job
Dozens of other catch viruses on quarantined cruises
A visual guide to the outbreak.
Meanwhile, 41 other people on a quarantined cruise ship in front of Japan have tested positive for coronavirus, bringing the total number of cases on board to 61.
Friday was positive news when the World Health Organization (WHO) said that fewer infections were reported in China in the past two days. However, CEO Tedros Adhanom Ghebreyesus warned against reading too much in those numbers.
He also told reporters that the epidemic caused a worldwide shortage of protective medical equipment, such as clothes, masks and gloves.
“When supply is low and demand is high, there may be bad practices such as hoarding to sell them at higher prices,” he warned, urging suppliers to “defend humanity’s protection” instead of trying to increase profits.
WHO also released new data from 17,000 patients who suggested that 82% had a mild form of the disease, with 15% considered severe and 3% critical.