Trip.com Group said the travel demand is expected to come up again strongly after the contagion is over, given the experiences during the SARS outbreak in 2003.
Trump offered his own assessment Saturday evening in a video from Walter Reed National Military Medical Center, saying he was beginning to feel better and hoped to "be back soon."
Tsingtao Brewery is the iconic business of Qingdao, the host city of the SCO upcoming 18th summit.
Trump, 74, plans to speak every day of the four-day convention, in contrast to his Democratic opponent, former vice-president Joe Biden, 77, who made brief taped appearances before his 20-minute acceptance speech last Thursday.
Trump also said Seoul and Pyongyang are "discussing an end to the war", and they have his blessing on that.
Trump is to visit China in November, as well as attend the Asia Pacific Economic Cooperation meeting in Vietnam, the White House announced earlier.
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Trump said after the G7 summit in France last month that he was not considering auto tariffs "at this moment".
Trump was critical but measured when asked about the two HQ2 winners by The Daily Caller?on Wednesday.
Trump's demand that money for the wall be included in spending legislation prompted an impasse with Democrats that led to a 35-day partial federal government shutdown that ended on Jan. 25.
Trump underwent the test on March 13. Those also having tested for the virus are first daughter Ivanka Trump, Vice President Mike Pence and his wife Karen Pence, and the results are all negative.