We keep encouraging countries to develop a plan because a pandemic is inevitable.

All of these have been in Asia. But it is important to note that it was not passed on to more humans. The chain ended at those four or five who caught it.

We're not going to know how lethal the next pandemic is going to be until the pandemic begins. You could pick almost any number.

There are a lot of scary stories out there about the next pandemic, but we have to make difficult decisions without a lot of information. The real answer is we don't know until the next pandemic virus appears.

That's because we looked at what happened in the 1918 pandemic. That caused the greatest number of deaths ever recorded from an infectious disease in a single year, by far. More than the black plague, more than any other infectious disease,

We are concerned that the virus infects a human that already has contracted a strain of normal influenza and this influenza will mix with this avian form. As a result, a new strain could be formed that the human immune system has never seen before and that would ignite a pandemic.