CLIFF BOND: A lot of people talk about whether viruses are alive or dead. My feeling has always been: not only are they alive, they also have innate intelligence. I mean, they're certainly smarter than we are - they know exactly how to take us over.

All of us have had viruses and boy, they really attack. And there's not a whole lot we can do about it. If you get a fairly serious viral disease, and go to the doctor, the doctor will tell you, 'You have a virus.' And that's pretty much the end of it. Antibiotics are no good against viruses.

We can use support therapies, we can treat your symptoms, but there's not much we can do about most of the viral diseases. It's all up to your immune system.