Officials in the capital Beijing and Guangdong also announced three new cases in their respective areas, bringing the total number of diagnoses to more than 200.
An additional two cases have been reported in Thailand and one in Japan.
"People's lives and health should be given top priority and the spread of the outbreak should be resolutely curbed", the state television quoted Mr Xi as saying. At first, the source was thought to have been a seafood market in Wuhan that sold live animals like bats, marmots, cats, dogs, and snakes in addition to fish but this is not yet confirmed.
But the worries are growing outside Wuhan as several areas have reported cases of the new virus strain named 2019-nCoV by the World Health Organization.
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Wuhan is a city of 11 million inhabitants that serves as a major transport hub, including during the annual Lunar New Year holiday, when hundreds of millions of Chinese people travel across the country to visit family.
In a press statement, the ministry said that it was notified of a 44-year-old female Singapore resident with pneumonia, who had travelled to Wuhan, as of 10am on the same day.
It is the most populous city in Central China with a population of almost 20 million people in the metro area.
South Korea's Centres for Disease Control and Prevention (KCDC) said the patient is a 35-year-old Chinese woman and resident of Wuhan, China who flew from Wuhan to Incheon global airport yesterday.
Others strains are more severe, including the deadly SARS, which killed 700 people when it broke out in China during 2002-2003.
The province has found five people traveling from the city of Wuhan in central China with respiratory symptoms since January 17, Zhejiang province's health commission said in a statement on its website, adding that the patients are in stable condition and their close contacts have been placed under medical observation.