To the delight of Eurosceptics, the prime minister will throw down the gauntlet to his fellow EU leaders to agree to a revision of Britain's membership terms within two and a half years of the next general election or risk triggering a British exit.
But as long as there are cases, there is the possibility of spread to a new region, triggering another outbreak.
Israel accused Hamas of violating the latest of a series of temporary ceasefires after rockets were launched from Gaza on Tuesday hours before the end of the latest truce, triggering a swift military and political response.
An estimated €20bn is believed to have fled local lenders since December, when Athens was plunged into political turmoil with parliament's failure to elect a new head of state automatically triggering snap polls.
Risks of rectal feeding and rehydration include damage to the rectum and colon, triggering bowels to empty, food rotting inside the recipient's digestive tract, and an inflamed or prolapsed rectum from carless insertion of the feeding tube.
The steamroller was to prove unstoppable all the way to the mass riots of 1990 after its introduction into England and Wales – and its role in triggering Thatcher's downfall six months later.
The bond markets took fright, pushing up the risk premiums on Greek borrowing to exorbitant levels and triggering a spiral of panic and brinkmanship that engulfed Ireland and Portugal and exposed the flimsy foundations of the common currency.
It took three more years for a case against Nadir to be assembled, triggering his midnight dash from a small airfield in Dorset, in flight from more than 50 fiercely contested charges.
The soon-to-be-published Chilcot report is expected to contain damning evidence surrounding how Blair and Bush jointly engaged in a rush to war to topple Saddam Hussein in the face of warnings of the risks of triggering sectarian divisions across the region.
"The good news is we are one election away from triggering another American century".
The parties in Stormont were close to triggering an election as the two main forces in government – Sinn Féin and the Democratic Unionist party (DUP) argued over welfare reforms.
