A view of the Ningbo-Zhoushan Port in Ningbo, East China's Zhejiang Province on August 15, 2021. Photo: Xinhua

The asymptomatic Ningbo port worker in East China's Zhejiang Province has no relationship with the latest wave of domestic epidemic cases after viral gene sequencing and epidemiological investigation was completed, Zhejiang authorities announced on Wednesday.

The virus gene sequence of Ningbo's case and the latest wave of Delta variant in domestic cities such as East China's Nanjing are from different sources, said the authorities.

The 34-year-old patient surnamed Yu worked at a container shipping company in Ningbo port, the world's largest port in terms of annual throughput, and had not gone abroad or visited the domestic medium- and high-risk areas two weeks before he tested positive on August 11.

The patient worked with foreign cargo ship from August 4 to 5, while the ship had docked in Vladivostok, Russia, from July 27 to 29, with 11 of the 18 crew members testing positive for coronavirus, which suggested that Yu was infected via coming in contact with a cargo crew member or goods that tested positive, according to the authorities.

As of Tuesday, over 120,000 residents in Ningbo's Beilun district, where Yu live, have taken three rounds of nucleic tests, and all turned out negative, the local authorities said. All internet cafes, entertainment venues, performance halls, cinemas, gyms, bars, foot massage and bath centers as well as religious places in the district have been ordered to temporarily shut down.