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Children who cannot have porcine gelatine in medical products will be offered an injection.

Pigs can carry viruses such as porcine cytomegalovirus, the one that was detected in Bennett, the person who received a pig heart transplant in 2022.

For example, the company Revivicor, which is owned by United Therapeutics and provided the pigs used in the University of Maryland transplants, leaves the porcine viral genes intact.

Up to 65% of the cells in these organs were human, indicating the stem cells had spawned kidney cells in their porcine surroundings.

First, what pig to use: Some have up to 10 genetic changes but Montgomery is betting one is enough — removal of a single porcine gene that triggers an immediate immune attack.