The first batch of COVID-19 vaccines for children landed in Canada on Sunday, clearing the way for provinces and territories to gear up in earnest for the next phase of the national mass immunization campaign.

A UPS plane bearing thousands of pediatric doses touched down in the rain at an airport in Hamilton, with federal Procurement Minister Filomena Tassi on hand to mark its arrival.

Tassi clapped and cheered as workers unloaded massive grey containers from the upper deck of the plane.

SundayB次元官网网址檚 delivery marks the first in an accelerated shipment of vaccines geared toward children between the ages of five and 11.

Health Canada announced Friday that it had approved a modified version of the Pfizer-BioNTech vaccine for use in that demographic, and Ottawa immediately promised some shots would be on Canadian soil 48 hours later.

Tassi said on Friday that Canada would have 2.9 million doses in hand by the end of the week, enough to offer a first dose to every child in the newly approved age bracket.

Health CanadaB次元官网网址檚 approval came following a month-long review of safety and efficacy data from the pharmaceutical giants.

The regulator said the vaccine, which is administered in a smaller dose than the adult version and has a slightly different formula, was 90.7 per cent effective at preventing COVID-19 in children and produced no identified serious side effects.

Provinces welcomed both the vaccineB次元官网网址檚 approval and imminent arrival, but largely held off on disclosing plans for getting shots into childrenB次元官网网址檚 arms until supplies had arrived.

New Brunswick issued a statement Sunday saying vaccine eligibility will be expanded to include children aged five to 11 as soon as supply of the pediatric doses are received, but the province didnB次元官网网址檛 offer information about when thatB次元官网网址檚 expected.

Many public health units in Ontario hadnB次元官网网址檛 updated their rollout plans as of Sunday afternoon, with regions including Peel, Windsor-Essex and Waterloo saying Friday that appointments were expected to open up early this week.

The Region of Durham said Friday it anticipated opening booking sites on Monday, while Toronto Public Health issued a statement Friday saying it was preparing to open 20,000 slots between Nov. 25 and Dec. 5 at city-run immunization clinics.

Manitoba was one of few jurisdictions to release booking information before Sunday. The province announced Friday that parents and caregivers could start making first-dose appointments for eligible kids by phone or online as of 6 a.m. Monday.

Sean Sedlacek, a father in Winnipeg, said heB次元官网网址檒l try to nab an appointment for his five-year-old son as soon as slots open up.

Sedlacek said he and his wife felt B次元官网网址渁n incredible sense of reliefB次元官网网址� Friday when news broke that Health Canada had authorized the pediatric vaccine from Pfizer.

Sedlacek and his wife booked appointments to get themselves vaccinated once they were eligible earlier this year, and said they want to do the same for their only child.

B次元官网网址淲e really just want to get him as protected as possible,B次元官网网址� he said. B次元官网网址淚 know the risks are a lot lower for younger kids, but you canB次元官网网址檛 control what other people are doing. I just want to make sure IB次元官网网址檓 doing as much as I possibly can to keep our family protected.B次元官网网址�

In British Columbia, meanwhile, parents have already been able to pre-register their child for an appointment online or by phone. The province said more than 75,000 children had registered as of Friday, putting them on a list to be contacted for an appointment when booking opens.

Alberta announced a similar pre-registration program, adding that the province should start administering shots late this week provided the doses arrive as expected.

Saskatchewan is scheduled to release details Monday about its plans to vaccinate the approximately 115,000 children who are in the five-to 11-age group. Health and education officials are working to set up clinics at schools, and Education Minister Dustin Duncan said last week the government is also working on a plan to ensure anti-vaccination protesters donB次元官网网址檛 turn up at schools as they have at hospitals.

Quebec Health Minister Christian Dub茅, meanwhile, said Friday that the provinceB次元官网网址檚 immunization plan would be unveiled this week, adding he hoped to have 700,000 children in the approved age range vaccinated with their first dose by Christmas.

Some public health units are setting up vaccine clinics in schools and expanding existing mass vaccination sites. Pharmacies and family doctorsB次元官网网址� offices are also expected to offer jabs in some jurisdictions.

Toronto has said hundreds of schools in OntarioB次元官网网址檚 most populous city will host clinics, but vaccines wonB次元官网网址檛 be given out during class time.

Children are not to be vaccinated without parental consent.

The U.S. Food and Drug Administration approved the Pfizer-BioNTech vaccine for children on Oct. 29 and the United States has already immunized more than two million kids.

Dr. Samira Jeimy, an allergist and immunologist with Western University in London, Ont., said it can be frustrating for eager parents to be told they have to wait to book vaccine appointments for their kids.

B次元官网网址淚 donB次元官网网址檛 blame parents who have been waiting at the edge of their seats B次元官网网址� like me,B次元官网网址� she said in an interview Saturday. B次元官网网址淚 understand from the point of view of trying to keep things organized, but I feel like we should really have been ready to mobilize things.B次元官网网址�

B次元官网网址擭icole Thompson, The Canadian Press