Migratory birds are the main distributors on the international scale and there is no way to stop them. Locally, migratory fowl and the trade in live and recently dead poultry keep it in circulation, too.

We try to stay out of the business of making predictions, but it seems reasonable to assume that the virus will continue to spread to adjacent areas.

In an epidemic, when you have a well informed public you have a far greater chance that there will not be any panic and that they will do things to keep themselves healthy and slow the spread.

The more widespread it becomes, the greater the possibility that the (bird flu) virus could become altered and become more of a threat to the human population.

Inevitable is a strong word.

Our review of the literature says this appears to be bigger than in the past.

It's not clear to us why we're seeing such a large case number.

We are looking at not just a bacteria being active in one herd of pigs but over a fairly wide area, with isolated villages. Gathering information in that sort of situation is difficult.

A prime task of the WHO experts and their Chinese counterparts will be to conclusively decide if the laboratory was indeed the source of these people's infections.