加拿大确诊5例Omicron新变种，其中4例在渥太华，一例在魁北克，都与非洲旅行有关，处于自我隔离状态。
加拿大与美国的边境限制将于周二放宽，完全接种疫苗的跨境旅行者被允许重新进入加拿大，而无需提供 Covid-19 阴性测试，前提是他们离开的时间不超过 72 小时。
但与航空旅行相关的其他措施在周二收紧，国际和国内的航空和铁路乘客需要提供疫苗接种证明才能旅行。
4 hr 40 min ago
Canada has 5 confirmed cases of Omicron variant
From CNN’s Paula Newton
Canada has now confirmed 5 cases of the Omicron coronavirus variant and health officials in several provinces say they continue to investigate dozens of other suspected cases across the country.
Four of the five cases have been confirmed in Ottawa and all are linked to recent travel to Nigeria.
On Monday, Dr. Vera Etches, Ottawa’s medical officer of health, confirmed two more cases were identified in addition to the prior two cases announced on Sunday and she indicated that no one is currently hospitalized.
“The individuals, all 4, are self-isolating,” she said in a statement during a local health board meeting adding that any international travel at this time could potentially expose people to the new variant given where and when cases have been detected.
Canada’s health minister said in a statement Sunday that “it is expected that other cases of this variant will be found in Canada”.
The fifth case of the variant has been identified in the province of Quebec, also linked to travel from Nigeria.
Quebec’s health minister, Christian Dubé, speaking at a news conference Monday said more than a hundred travelers from southern African countries were asked to take a new Covid-19 test and isolate.
However, Dube also suggested that Nigeria should possibly be added to the list of countries currently included in a travel ban to Canada. He said he had spoken of the issue with Jean-Yves Duclos, Canada’s health minister.
“They need to take very quick decisions on additional countries and if this is not enough, depending on how the epidemiology accelerates, should we have additional measures like PCR (testing) at airports to make sure that we are restrictive on any countries,” said Dube.
More on this: The Hong Kong government
banned entry to travelers from Canada Tuesday after a Canadian man arrived from Vancouver and later tested positive for the Omicron variant.
Canada’s border restrictions with the US meantime are set to ease Tuesday with fully vaccinated, cross-border travelers allowed to reenter Canada without providing a negative Covid-19 test, provided they are gone for less than 72 hours.
But other measures related to air travel were tightened Tuesday with air and rail passengers both internationally and domestically needing to provide proof vaccination in order to travel. 
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