There is no data available on the interchangeability between COVID‑19 vaccines, such that, where possible other vaccines should not be substituted to complete the course. So far, the only COVID-19 vaccine available for use in New Zealand is Comirnaty (Pfizer/BioNTech). Other vaccines are undergoing the Medsafe approval process.
To be fully immunised with Comirnaty, two doses are required, to be given at least 21 days apart. There is no maximum duration between doses, so it is not necessary to restart the course or give a third dose if it has been longer than 21 days since dose one.
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