Since carriage in the nose is the first step in causing disease, the increased rate of carriage suggests more frequent occurrence of the disease. Indeed, active and passive smoking are associated with increased rate of respiratory infectious diseases.

The fact that cancer remains the leading cause of death by disease in children makes me so committed to this cause. By shaving your head, you can be a hero for children with cancer. It's a perfect match because kids lose their hair during cancer treatments, and people will pay money to see you bald.

What if we're seeing the stirrings of 'Dutch disease', whereby windfall gains from commodity industries push up the currency so as to squeeze activity in more productive sectors like manufacturing?

Hepatitis A, among the various hepatitis diseases that we have, is a very mild disease, generally causing fever, malaise, nausea and jaundice. But in general, it is a very mild disease.

We need to find out more about the source of the disease before we can decide when to lift the ban,

Gene therapy is a promising approach to curing disease, but for a number of years, the problem has been the vehicles in which we deliver the genes.