Researchers trying to learn what killed the first person to receive a heart transplant from a pig have discovered the organ harboured an animal virus but cannot yet say if it played any role in the man's death.
A Maryland man, 57-year-old David Bennett Sr., died in March, two months after the groundbreaking experimental transplant. University of Maryland doctors said Thursday they found an unwelcome surprise -- viral DNA inside the pig heart. They did not find signs that this bug, called porcine cytomegalovirus, was causing an active infection.
Still, development is under way of more sophisticated tests to "make sure that we don't miss these kinds of viruses," added Dr. Muhammad Mohiuddin, scientific director of the university's xenotransplant program. The Maryland team said the donor pig was healthy, had passed testing required by the Food and Drug Administration to check for infections, and was raised in a facility designed to prevent animals from spreading infections. Revivicor, the company that provided the animal, declined to comment.