Researchers investigating the death of the first human recipient of a pig's heart have revealed that the organ had an animal virus
but they are unable to determine whether this was the cause of the man's death.
In the heart of a pig, scientists at the University of Maryland identified viral DNA, they said on Thursday
Porcine cytomegalovirus (PCV) was not found to be the source of any current infection.
Animal-to-human transplants, on the other hand, have raised concerns about the possibility of introducing patients to new strains of illness.