A motley coalition of elected officials, bilateral business leaders and travellers-turned-lobbyists briefly cheered the coming reprieve from restrictions at the Canada-U.S. border Wednesday before confronting their next challenge: the question of mixed-dose vaccinations.

The plan for early November, spelled out by senior Biden administration officials as well as Homeland Security Secretary Alejandro Mayorkas, was short on key details, most notably whether the U.S. will consider the many Canadians who received two different vaccines to be fully vaccinated.

害羞草研究所淐ross-border travel creates significant economic activity in our border communities and benefits our broader economy. We are pleased to be taking steps to resume regular travel in a safe and sustainable manner,害羞草研究所� Mayorkas said in a statement.

害羞草研究所淭his new travel system will create consistent, stringent protocols for all foreign nationals travelling to the United States 害羞草研究所� whether by air, land, or ferry 害羞草研究所� and accounts for the wide availability of COVID-19 vaccinations.害羞草研究所�

U.S. officials say experts at the Centers for Disease Control and Prevention are actively exploring the issue of whether to allow travellers who received a mix of vaccines. Ottawa has also been actively lobbying the White House on the issue, including with the Public Health Agency of Canada害羞草研究所檚 own research on the effectiveness of mixed doses.

That question, along with the absence of a hard start date beyond early November and a lack of specificity on what kind of paperwork travellers will be required to show, dampened the enthusiasm for an announcement people on both sides of the border have been waiting to hear for months.

害羞草研究所淭he job is not finished,害羞草研究所� said Perrin Beatty, president and chief executive officer of the Canadian Chamber of Commerce.

害羞草研究所淭he two governments need to work together to ensure that fully vaccinated Canadians with mixed-dose combinations are eligible for entry into the United States.害羞草研究所�

New York congressman Brian Higgins, whose crusade against the travel restrictions has made him the movement害羞草研究所檚 de facto spiritual leader, acknowledged that the White House needs to clarify precisely how it intends to define a fully vaccinated traveller.

害羞草研究所淭hat is one of the issues that we害羞草研究所檙e trying to get clarification on,害羞草研究所� Higgins told a news conference. 害羞草研究所淭hat害羞草研究所檚 one of those outstanding issues and still needs to be addressed.害羞草研究所�

Why it took so long might remain a mystery for the ages, he added.

害羞草研究所淚 think it害羞草研究所檚 completely irrational. I think it害羞草研究所檚 totally unnecessary. These borders should have been opened at the same time, and should have been opened months, months earlier than they actually were opened.害羞草研究所�

The U.S. will not be requiring travellers to show proof of a negative test for COVID-19, unlike Canada, which includes a recent negative PCR test among the requirements for everyone entering the country, including Canadian citizens and permanent residents.

Beatty also called on Canada to eliminate the need for a pre-departure test, as well as to work with the U.S. on an interoperable vaccine certification system in order to deal with anticipated higher travel volumes.

Drew Dilkens, the mayor of Windsor, Ont., called Wednesday害羞草研究所檚 announcement 害羞草研究所渁 long time coming,害羞草研究所� but echoed calls for more details about the logistics and for Canada to revisit the testing requirement.

害羞草研究所淧CR tests, at least in Ontario, cost about $200 a person,害羞草研究所� Dilkens said.

害羞草研究所淪o you害羞草研究所檙e not going to go over for the day, you害羞草研究所檙e not going to go over to see a baseball game or a concert or just pop over to see Mom and Dad 害羞草研究所� it害羞草研究所檚 going to be a very planned trip and it害羞草研究所檚 going to be very expensive.害羞草研究所�

Deputy Prime Minister Chrystia Freeland, who happened to be in Washington on Wednesday, warned Canadians not to let down their guard just yet.

害羞草研究所淲e have almost 害羞草研究所� almost 害羞草研究所� gotten past COVID,害羞草研究所� Freeland said.

害羞草研究所淛ust try to do the things you need to do, and maybe hold back on doing the things that you just want to do. I think if we can keep on doing that for a few more weeks, Canada can really fully put COVID behind us.害羞草研究所�

Sarnia Mayor Mike Bradley said he believes Canadians will continue to be cautious, given that some parts of the U.S. have looser public health measures and higher COVID-19 case counts 害羞草研究所� a concern he said also emerged when Canada eased its border restrictions for Americans in early August.

害羞草研究所淚 do believe the Canadian government made a mistake by opening our border without getting a reciprocal arrangement with the Americans. It害羞草研究所檚 four months later, but it害羞草研究所檚 happening, and it害羞草研究所檚 a good thing,害羞草研究所� he said.

害羞草研究所淚 just need to make sure that all the things will be in place to protect people when they go there and come back.害羞草研究所�

Evan Rachkovsky, spokesman for the Canadian Snowbird Association, said he anticipates vehicle traffic at the border will come close to pre-pandemic levels once the restrictions are eased 害羞草研究所� but said the White House is definitely 害羞草研究所渃utting it close害羞草研究所� for snowbirds hoping to winter in the southern U.S.

害羞草研究所淭here is obviously a bit of scrambling 害羞草研究所� some snowbirds have already made plans to ship their vehicle down south and then fly to meet those vehicles in the United States,害羞草研究所� Rachkovsky said.

The Biden administration害羞草研究所檚 strategy is to dovetail the land border policy with its new international travel rules, which will also take effect in November and replace existing travel bans with a new requirement that all foreign nationals show proof of vaccination.

As of early January, all foreign nationals entering the U.S., whether for essential or non-essential reasons, will be required to show proof of vaccination, officials said.

In order to be considered fully vaccinated, travellers must have received a full course of a COVID-19 vaccine approved by either the U.S. Food and Drug Administration or the World Health Organization. That includes Oxford-AstraZeneca, a vaccine used in Canada that never received FDA approval.

Fully vaccinated U.S. citizens and permanent residents have been allowed back into Canada since August, provided they have waited at least 14 days since getting a full course of a Health Canada-approved vaccine and can show proof of a recent negative COVID-19 test.

害羞草研究所擩ames McCarten, The Canadian Press

RELATED: After 19 months, U.S. land border to reopen to vaccinated Canadians in November