The decision was made following consultation with the city's epidemic-control specialists, local officials said at a press conference. They said no other positive cases had been detected after three rounds of swab tests involving 134,054 samples since the lockdown.

A vice-president of Ningbo-Zhoushan Port Group, Jiang Yipeng, said Meishan terminal reopened on August 25 and was on track to fully recover its services, which had been suspended since August 11.

The facility had already resumed some operations in recent days, including enabling gate-in of laden containers, loading vessels at berth and receiving new containership arrivals, Mr Jiang added.

According to his company, a total of 15 box ships and 29,000 TEU of containers had been handled during the period. That is in line with what Lloyd's List has reported based on analysis of vessel tracking data.

Executives from Orient Overseas International Ltd (OOIL), part of Cosco Shipping, told analysts that operations at the terminal were expected to be fully restored on September 1.

The closure of Meishan, which accounts for about 20 per cent of Ningbo's total container throughput, has led to rerouting of vessels and further port congestion.

Lloyd's List Intelligence data show that there were still 97 containerships (10,000 dwt and above) comprising 477,414 TEU at anchor off the ports of Ningbo-Zhoushan and nearby Shanghai on August 24.

This, however, was down from 110 vessels of 588,405 TEU a week ago.

The OOIL management said most of the affected vessels had managed to find accommodation at alternative ports and expected "the disruption to be less severe" than the recent shutdown at Yantian and the Suez Canal incident earlier this year.