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A special video conference joined by health authorities from the mainland, Hong Kong and Macao was held on Friday, during which experts had in-depth discussions on issues such as the construction and management of makeshift hospitals and nucleic acid testing.

"Once developed and deployed in China, COVID-19 vaccines will be provided to Mekong countries on a priority basis," he said, adding that countries need to carry out information sharing and joint responses in major public health emergencies, and jointly support the World Health Organization (WHO) in better playing its role.

During the expedition project, which came to an end in late July, three research vessels were organized for missions including samplings for topographic, hydrodynamic, meteorological, chemical, ecological, and biological research in different water areas near the islands, according to the South China Sea Institute of Oceanology of the Chinese Academy of Sciences.