China partly shut the world’s third-busiest container port after a worker became infected with Covid, threatening more damage to already fragile supply chains and global trade as a key shopping season nears.

All inbound and outbound container services at Meishan terminal in Ningbo-Zhoushan port were halted Wednesday until further notice due to a “system disruption,” according to a statement from the port. An employee tested positive for coronavirus, the eastern Chinese city’s government said.

The closed terminal accounts for about 25% of container cargo through the port, calculates security consultant GardaWorld, which said “the suspension could severely impact cargo handling and shipping.” Germany’s Hapag-Lloyd AG said there will be a delay in sailings.

Read more: Al Jazeera