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Quebec public-health authorities have determined that four people who were placed under hospital observation this week for possible exposure to the coronavirus originating from China were not, in fact, infected.

That leaves one individual who is still under observation, an official said.

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“Of the five cases under investigation mentioned yesterday, four cases have been dismissed” following the results of a highly sensitive test by the Quebec Public Health Laboratory, said Marie-Claude Lacasse.

“One case remains under investigation. This does not mean that this person has the nCov19 coronavirus. This means that the tests are still ongoing.”

Despite initial doubts, authorities had nonetheless decided to observe the five people from Montreal and the Quebec City region because they had all returned recently from travels to China, where the coronavirus has killed 25 people since an outbreak in late December in the city of Wuhan.