But the baby is not kept in a sterile bubble, like the child a few cabins away.

One way of preventing piglets picking things up is to have them born into a sterile bubble, and reared in squeaky-clean rooms.

In the film, John Travolta played "Tod," a teenaged boy who lived in a sterile bubble due to illness.

Untreated infants born with SCID who are not kept in a sterile bubble become ill within months and die before their first birthday.

Without this treatment, they would have been living in sterile bubbles until they could receive an alternative treatment - a transplant of bone marrow from a healthy donor - that has a limited success rate.

"So I can't get to the head...." "No problem, mon." The Zionite executed a high forward somersault and rummaged through the contents of a zippered mesh bag, coming up with a coil of transparent tubing and something else, something sealed in a sterile bubble pack.