Health Canada's chief medical advisor Dr. Supriya Sharma announced Thursday that Moderna's COVID-19 vaccine has been authorized for use for those from six months to five years old, adding it is a smaller dosage than what is being given to those above five or 12 and older.

Canada's deputy chief medical officer of health Dr. Howard Njoo said that a two-dose primary series can be given eight weeks between shots, with immunocompromised children recommended to get a three-dose series with four-to-eight week wait between shots.

Nearly 50 per cent of the Canadian population has received a third dose of COVID-19 vaccines, and fourth doses are now open for those 18-59 years old in Ontario as a summer wave of the virus is being fuelled by Omicron subvariants.

As the virus mutates, Pfizer and Moderna are currently testing in late-stage clinical trials an updated version of their COVID-19 vaccines to better target the Omicron variant and its sub-lineages.

Both companies are hoping for their variant-adapted vaccine to be ready for approval in the fall.

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