Adults in Ontario can begin booking a bivalent COVID-19 vaccine booster dose on Monday, the province says.

Updated bivalent COVID-19 vaccines that better target the latest Omicron variants are expected to receive approval in coming weeks and months.© Evan Mitsui/CBC

Spots opened for everyone as of 8 a.m. ET, though appointments for especially vulnerable people will be prioritized until September 26 before widening to all residents 18 and older.

Those vulnerable populations include:

• Ontarians aged 70 and older.
• Residents of long-term care homes, retirement homes, Elder Care Lodges and individuals living in other congregate settings that provide assisted-living and health services.
• First Nation, Inuit and Métis individuals and their non-Indigenous household members aged 18 and older.
• Moderately to severely immunocompromised individuals aged 12 and older.