Nov. 05--The World Health Organization is asking Canada to justify its decision to restrict travel from the West African nations hardest hit by Ebola.

The Canadian government announced Friday that it would no longer issue travel visas or process permanent residency applications for people from the countries with "widespread and persistent-intense transmission."

The move puts Canada at odds with the World Health Organization, which has repeatedly urged countries not to prohibit travel to and from Ebola-affected countries, including Liberia, Sierra Leone and Guinea.

WHO officials argue that such measures are counterproductive because they complicate efforts to deploy relief workers and supplies, and because they might encourage affected countries and individuals to conceal the disease.

International Health Regulations agreed to by Canada stipulate that countries that impose travel and trade restrictions that go over and above measures recommended by the WHO should provide a public health rationale that is based on science, WHO officials say.

"Any strong measures [like border closures] need to be well documented and explained to those who are suffering from those measures," the WHO's Dr. Isabelle Nuttall said in an interview Tuesday with the Canadian Press news agency.

"If not, they will just be circumvented. People will find a way to travel. And the consequence to a country might be even worse than not having had a travel ban."

Nuttall said she had asked the Public Health Agency of Canada for an explanation. The agency told the Canadian Press that it would respond to the WHO's request "in the near future."

Canadian officials say the travel ban does not apply to Canadian nationals, who will continue to be screened for Ebola at ports of entry along with visitors from countries that do not require visas. Exceptions can also be made for essential travel by citizens of other countries, they say.

The "No. 1 priority is to protect Canadians," Health Minister Rona Ambrose said in a statement last week.

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WHO Asks Canada To Justify Restricting Travel From Ebola Zone