The Associated Press reported that “several types of cell lines created decades ago using fetal tissue exist and are widely used in medical manufacturing but the cells in them today are clones of the early cells, not the original tissue.”
These cell lines were used to test the Pfizer and Moderna vaccines and to produce and test the Johnson & Johnson vaccine. J&J states that there is no fetal tissue in its vaccine.
The U.S. Conference of Catholic Bishops gave this guidance back in January: “Given that the COVID-19 virus can involve serious health risks, it can be morally acceptable to receive a vaccine that uses abortion-derived cell lines if no other available vaccines comparable in safety and efficacy with no connection to abortion.”
The Vatican agreed. Pope Francis had this to say: "Vaccination is a simple but profound way of promoting the common good and caring for each other, especially the most vulnerable. I pray to God that everyone may contribute their own small grain of sand, their own small gesture of love."