See this online text:

  • “Moral Considerations Regarding the New COVID-19 Vaccines”, by the Most Reverend Kevin C. Rhoades, Bishop of Fort Wayne-South Bend, Chairman, Committee on Doctrine, and the Most Reverend Joseph F. Naumann, Archbishop of Kansas City in Kansas, Chairman, Committee on Pro-Life Activities (Washington, D.C.: United States Conference of Catholic Bishops, December 14, 2020). Available in pdf format at the United States Conference of Catholic Bishops and the Diocese of Tucson.

See also these related texts outlining the general ethical norms on vaccines produced or tested using cells or tissue from aborted children:

See also these texts specific to the liceity of COVID-19 vaccines produced or tested using cells or tissue from aborted children:

On the Feast of the Holy Innocents (Childermas) in the Roman Rite. For other texts and ebooks on various subjects, you may access the List of Free eBooks (Arranged by Title), the List of Free eBooks (Grouped by Subject), the List of Worth-It Catholic Books & eBooks, and the main page of the Catholic eBooks Project.