Quote:
Originally Posted by Cecil Terwilliger
He said it was his second pfizer, not his second shot.
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Then it sounds like the second case I mentioned; receiving mixed first doses and needing a matching dose for travel.
See "Third dose for immunocompromised" and "Additional doses for travellers".
https://www.alberta.ca/covid19-vaccine.aspx
I would say anyone who got a mixed set for their first two shots and plan on doing any sort of traveling outside of Canada should be looking into it.