USCCB provides guidance on how to write a letter to pharmaceutical com regarding Vaccines.
https://www.usccb.org/resources/letters-pharmaceutical-companies

USCCB Link
Sample Letters 


Their recommendations come from the Vatican.

In the documents listed here, the Vatican urges everyone concerned for the sanctity of life to protest the use of abortion-derived cell lines and advocate for the development of vaccines with no connection to abortion. To make it easier to take this action, we provide the following sample letters to pharmaceutical companies that are using abortion-derived cell lines to produce and/or test vaccines.

This content is recommended by Fr. John Linden, Pastor of St. Andrew the Apostle Catholic Church.

To read the full document, please go to the USCCB Website at: 

https://www.usccb.org/news/2020/us-bishop-chairmen-pro-life-and-doctrine-address-ethical-concerns-new-covid-19-vaccines

USCCB LINK
COVID-19 Vaccines

With regard to the Pfizer and Moderna vaccines,
they concluded:

“In view of the gravity of the current pandemic and the lack of availability of alternative vaccines, the reasons to accept the new COVID-19 vaccines from Pfizer and Moderna are sufficiently serious to justify their use, despite their remote connection to morally compromised cell lines.

“Receiving one of the COVID-19 vaccines ought to be understood as an act of charity toward the other members of our community.  In this way, being vaccinated safely against COVID-19 should be considered an act of love of our neighbor and part of our moral responsibility for the common good.”

CONCLUSION The world is currently facing a health crisis. The number of deaths from COVID-19 is now almost one and a half million worldwide. In the United States, the toll is approaching 300,000. Given the urgency of this crisis, the lack of available alternative vaccines, and the fact that the connection between an abortion that occurred decades ago and receiving a vaccine produced today is remote, inoculation with the new COVID-19 vaccines in these circumstances can be morally justified. For our part, we bishops and all Catholics and men and women of goodwill must continue to do what we can to ensure the development, production, and distribution of a COVID-19 vaccine without any connection to abortion and to help change what has become the standard practice in much medical research, a practice in which certain morally compromised cell lines are routinely used as a matter of course, with no consideration of the moral question concerning the origins of those cell lines.

***Most Reverend Kevin C. Rhoades, Bishop of Fort Wayne-South Bend, Committee on Doctrine Chairman

***Most Reverend Joseph F. Naumann Archbishop of Kansas City in Kansas Chairman, Committee on Pro-Life Activities