A note from the Congregation for the Doctrine of the Faith, which was approved by Pope Francis, gives the green light during the pandemic to the use of vaccines.
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Note on the morality of using some anti-Covid-19 vaccines: https://press.vatican.va/content/salastampa/it/bollettino/pubblico/2020/12/21/0681/01591.html#ing
Vatican News: https://www.vaticannews.va/en/vatican-city/news/2020-12/vatican-cdf-note-covid-vaccine-morality-abortion.html