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Conducting nucleic acid tests on all Wuhan residents is no easy task in terms of mobilization and organization, he said at a news conference.

Complaints made by travelers, however, decreased 9.25 percent from last year, according to the academy.

Congratulatory video footage of Russian President Vladimir Putin and leaders of other co-organizing countries were also broadcast in the opening ceremony.

Competitors Moderna and Pfizer are among those also developing a vaccine.

Concerns about a trade war between the US and China and other US key trade partners have grown lately after Trump imposed tariffs on imported washing machines and solar panels in January and signed proclamations this month on 25 percent tariff on steel imports and 10 percent tariff on aluminum imports in the name of national security under the controversial Section 232 of US Trade Expansion Act of 1962.