“A longer interval between doses leads to stronger immunity,” said Howard Njoo, the deputy public health officer of Canada.

Canada’s health regulator approved Pfizer’s kid-size COVID-19 shot on Friday, for children ages 5 to 11. And as in the U.S., the doses will be just a third of the amount given to teens and adults, AP reports.

But Canada’s National Advisory Committee on Immunization has suggested that the country’s provinces, which administer health care in the country, offer the two doses at least eight weeks apart.

In the U.S. 5- to 11-year-olds receive two low doses, three weeks apart, the same schedule as everyone else in the U.S. Canada had problems getting vaccines into the country early this year and delayed a second dose for adults until more supply came in, but Canadian officials say delaying a second dose provides better protection.

“A longer interval between doses leads to stronger immunity,” said Howard Njoo, the deputy public health officer of Canada.

The government agency said the vaccine is 90.7% effective in preventing COVID-19 in children and no serious side effects were identified.

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