Overview
- The Vatican published an 88-page guidance Tuesday that says Catholic teaching allows animal organs, tissues, or cells for treatment when medical standards and animal welfare rules are followed.
- The document requires doctors to explain risks such as immune rejection and possible cross-species infection.
- It was drafted with input from physicians in Italy, the United States, and the Netherlands, and it urges research that is purposeful, proportionate, and sustainable.
- Xenotransplantation, the use of animal parts in people, remains rare, with the first reported pig-to-human kidney transplant carried out in the United States in 2024.
- The guidance updates a 2001 Vatican go-ahead and may ease concerns for Catholic patients as researchers test genetically modified pig and cow organs to help relieve the donor shortfall.