On May 23, health officials announced a second, larger outbreak.

Vietnam and Singapore have also managed to bring large outbreaks under control.

Fall was very quiet, and saw no large outbreaks.

It was the largest outbreak of attacks since the Government began its war on drugs.

It's by far the largest outbreak in the world today.

More than 70 people have now died from it in Britain, where the largest outbreak has been recorded.

There are serious concerns of students passing along the virus to the community, creating a large local outbreak.

But we may not see the large outbreaks of human disease on an annual basis that we've seen in the past six years.

In some large outbreaks, a million or more birds may die.

But no large outbreak occurred; the largest death toll in a single year was 17.