For those who are taking more than one initial dose of the vaccine*, the initial doses should be of the same brand. Additional doses of the COVID-19 vaccine can be of different brands, where applicable.

From time to time, the strain of a COVID-19 vaccine may be updated to target more recent virus variants. If you are due for a vaccine dose, you are recommended to receive the updated version of the vaccine. There is no need for your vaccine doses to be of the same strain.

*Persons who should take more than one initial dose include:
• Immunocompromised persons (three initial vaccine doses); and

• Children aged 6 months to 4 years (two initial doses)