I have already asked a question about the more general issue of medical passes ('vaccine passes') here

https://christianity.stackexchange.com/questions/84217/does-the-catholic-church-have-an-official-position-on-domestic-health-passes-o

The answer seems to be 'no', the Church has no official position.

These medical passes are now a reality in multiple regions, including the one I live in, and have led to de facto segregation once implemented, preventing anyone who for reasons of conscience decides to opt out of the injections to be barred from basic aspects of civic life. The Church's silence on this speaks volumes.

Yet what about these passes being used as barriers to attending Mass? Does the Catholic Church have any official position on this very real possibility?

Update: Archdiocese of Moncton, New Brunswick [now requires][1] double injection.

> "at any gathering inside our churches, rectories or community centres
> under our supervision, those present must be doubly vaccinated [...] By gatherings we mean: religious celebrations (Sunday and weekly **masses**, prayer meetings, baptisms, weddings and funerals, Confirmation, First Reconciliation, First Communion) [and so on.]"


  [1]: http://www.diomoncton.ca/en/news-item/covid-19-green-phase-september-17th-2021-update