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China reported only 21 new cases of coronavirus on Monday — with all but one brought in by travelers from overseas, according to officials.

The sole case of domestic transmission was in Wuhan, the city that was put on complete lockdown after the pandemic emerged there in December, the National Health Commission said.

The drastic drop in numbers in the city — which previously reported hundreds of new cases each day — boosts President Xi Jingping’s claim that the nation had “basically curbed” the spread of the disease.

It also marks a turning point where there have now been more cases reported overseas than in China itself.

The biggest threat now is travelers bringing back the contagion from where it has spread overseas, officials warn, sparking stringent new restrictions for the 20,000 people who fly into China on an average day.

Beijing Capital International Airport has cordoned off a special zone for all international flights, with all disembarking passengers required to submit to health checks.

Transit passengers are sent to their connecting flights, while the rest are forced into a compulsory 14-day quarantine.

On Tuesday, Shanghai extended existing quarantine measures to travelers who have recently visited the United Kingdom, Switzerland, Sweden, Belgium, Norway, the Netherlands, Denmark and Austria.

Nine of the 20 new imported cases were reported in Beijing, while three were detected in Shanghai, raising the total number of confirmed infections from abroad to 143, according to health commission.

With Post wires