Religious groups: Some religious groups oppose xenotransplantation on the grounds that it violates natural order or is an affront to God. For example, the Catholic Church has expressed reservations about xenotransplantation, arguing that it could lead to a loss of respect for human life.
Environmental groups: These groups worry that xenotransplantation could lead to the introduction of new diseases into the environment, or that it could disrupt the ecological balance. They also argue that xenotransplantation is a waste of resources, and that there are other ways to treat diseases without resorting to animal organs.
Public health groups: These groups worry that xenotransplantation could lead to the spread of diseases from animals to humans. They also argue that there is not enough data to ensure the safety of xenotransplantation, and that it is premature to move forward with clinical trials.
Patient advocacy groups: Some patient advocacy groups oppose xenotransplantation on the grounds that it could lead to discrimination against patients who receive animal organs. They also worry that xenotransplantation could be a costly and ineffective treatment option, and that it could divert resources from other, more promising treatments.