Pfizer-BioNTech submitted an authorization request to Health Canada on Monday for the use of its Covid-19 vaccine in children aged 5-11, the companies and the Canadian government said.
"This is the first submission Health Canada has received for the use of a Covid-19 vaccine in this younger age group," it said in a statement.
This same Pfizer-BioNTech vaccine is approved in Canada for ages 12 and up.
Health Canada said that it will only authorize the use of the vaccine if the independent and thorough scientific review of all data submitted confirms that the benefits outweigh the risks with this group.
The Canadian ministry also indicated that other manufacturers also were testing their vaccines on children of different age groups.
Earlier this month, Pfizer and BioNTech laboratories made the same request for 5-11 year olds in the United States.
Childhood immunizations are raising questions around the world. Many countries vaccinate adolescents from the age of 12, but very few do so below that age.