A letter from the USCCB:

Please see below the statement from the chairmen of the Committee on Doctrine and the Committee on Pro-Life Activities on the COVID-19 vaccine (press release on December 14, 2020: English / Spanish). There is now a new FAQ on this topic from the Pro-Life Activities office.
 
Please see links below to the full statement from the chairmen and FAQs on the vaccines:

• Answers to Key Ethical Questions About COVID-19 Vaccines: English and Spanish

• Moral Considerations Regarding the New COVID-19 Vaccines: English and Spanish

• Interview with Archbishop Naumann of Kansas City in Kansas, chairman of the USCCB's Committee on Pro-Life Activities - EWTN Pro-Life Weekly Host Discusses Conversation with Archbishop Naumann Regarding COVID Vaccine Ethics

• National Catholic Register - Archbishop Naumann on the Ethics of COVID-19 Vaccines

• Catholic News Service - Naumann: Vaccine objectors still have ‘responsibility to protect public health’