The critical moment for the 2009 outbreak was between 1990 and 1993.

He said health officials had yet to determine a cause for the outbreak.

Third point: how are we to pay for such outbreaks in future?

Police were on guard tonight for further outbreaks of violence.

There has been no clear explanation for recent individual outbreaks of the disease.

This was to be the signal for the outbreak of revolution.

All patients recovered within 4 to 26 days, and at the time there was no apparent cause for the outbreak.

She seemed to brace herself for the outbreak that must follow.

A neat enough arrangement had it not been for the outbreak of war.

And they would set the stage for the outbreak of a trade war with our closest allies.