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Canada's聽Conservative government said it is suspending visa applications for residents and nationals of countries with "widespread and persistent-intense transmission" of the聽Ebola聽virus.

With Friday's decision,聽Canada聽joined Australia in suspending entry visas for people from Ebola-stricken countries in West Africa in an attempt to keep the deadly disease away.

Canada聽has not yet had a case of聽Ebola. Canadians, including health-care workers, in West Africa will be permitted to travel back to聽Canada, the government said.

The countries most severely hit by the worst聽Ebola聽outbreak ever are Liberia, Sierra Leone and Guinea.聽Canada receives very few travelers from those countries, which have no direct flights to聽Canada.

Canada's announcement comes at a time when there are signs that the corner may have been turned on ebola in West Africa.聽

On Friday, a new treatment center was opened in Monrovia, Liberia.聽The opening of the center, built out of white plastic sheeting with USAID written across it, comes as fewer people are showing up for treatment at various centers. Officials are not sure how to interpret that. Some believe it's a sign that the聽Ebola聽outbreak is finally on the wane in Liberia.

"It is heartening to see that we are finally perhaps catching up with that boulder if not in front of it. It was rolling down the hill at a speed that we were never going to catch, we thought, two months ago, but we're starting to make progress," said U.S. Ambassador Deborah Malac.

The World Health Organization said this week that the rate of infection in Liberia appears to be falling but warned that the response effort must be kept up.

A similar visa ban by Australia was slammed Wednesday by Dr. Margaret Chan, the WHO's director general, who said closing borders won't stop spread of the聽Ebola聽virus.

Canadian Health Minister Rona Ambrose said in a statement the "number one priority is to protect Canadians." Canadian Immigration Minister Jason Alexander said the government would act in the "best interests of Canadians."

Kevin Menard, a spokesman for Alexander, said the move is similar to but a bit less restrictive than the one the Australian government announced this week. He later called it "considerably different."

"We have instituted a pause, but there is room for discretion and if we can be assured that someone is not infected with聽Ebola," Menard said in an email after declining to comment on the phone. He said the government was "doing anything we can to keep聽Ebola聽from coming to聽Canada."

Nancy Caron, a spokesman for Citizenship and Immigration聽Canada, said that "a number of African countries have imposed stricter travel bans as have several other countries around the world. Other countries such as the United States have started to place restrictions on travelers from countries with聽Ebola聽outbreaks."

The government said Canadian citizens or foreign nationals with a visa and foreign nationals who do not require visas will continue to be screened at ports of entry in聽Canada聽and will be subject to appropriate health screening.

Declining to criticize the move, an Obama administration official said Friday that聽Canada聽remains an important partner in the effort to stop聽Ebola. The official was not authorized to discuss diplomatic relations by name and spoke on condition of anonymity.

Stephane Dujarric, a spokesman for the United Nations secretary-general, said the world body welcomed聽Canada's support in fighting the聽Ebola聽outbreak but also advocated "against isolating the three most impacted countries and stigmatizing its citizens."

David Fidler, an international law professor at Indiana University, said the moves by聽Canada聽and Australia place both countries in violation of the International Health Regulations, a 2005 World Health Organization treaty to which both are signatories.

The treaty "just seems to be disintegrating in this聽Ebola聽panic," Fidler said. "And to have countries like Australia and Canada聽be in the forefront of this is even more disheartening," he said, because they had been supportive of the international treaty meant to prevent panic during such a health crisis.

New Democrat Libby Davies of the Canadian opposition also criticized the visa ban, citing criticism by the World Health Organization and the World Bank and questioning the announcement's timing.

"Sending this announcement on a Friday afternoon only worsens concerns that this policy is a public relations exercise, and irresponsibly ignorant of what health experts have advised," she said.?

The International Health Regulations are designed to help the world fight infectious disease outbreaks that have the potential for international spread. They were revised and strengthened in the wake of the 2003 SARS outbreak.

The 2003 outbreak in Asia and聽Canada聽of SARS, or severe acute respiratory syndrome, led the World Health Organization to issue travel advisories directing people around the world to avoid places battling severe outbreaks. Ontario's then health minister, Tony Clement 鈥� now a federal cabinet minister鈥� was among those incensed by the WHO's move. Clement led a delegation to Geneva to successfully demand the WHO rescind the travel advisory against Toronto.

More than 13,500 people have been sickened by the disease, and nearly 5,000 have died, the World Health Organization said Friday. That toll has about 130 fewer cases than the one released by WHO two days ago, mostly because a number of suspected cases in Guinea were determined to not be聽Ebola, the agency said.聽

The hardest hit countries of Liberia, Sierra Leone and Guinea have resorted to extraordinary measures to combat it.

Canada聽has donated 800 vials of an experimental聽Ebola聽vaccine to WHO.

The vaccine, developed by the Public Health Agency of聽Canada聽and known as VSV-EBOV, has been sent to the U.S. Walter Reed Army Institute of Research in Maryland for testing on healthy volunteers, with preliminary results about its safety expected by December. The next stage would be to test it more broadly, including among those directly handling聽Ebola聽cases in West Africa.

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Associated Press reporters Darlene Superville in Washington and Cara Anna at the United Nations contributed to this report.

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