How many survivors of world war 1 are left?

As at 18 July 2009 there are just four known living confirmed veterans of the first world war. They are Harry Patch - Served in the Duke of Cornwall's Light Infantry and was wounded at Passchendaele in 1917. Claude Choules served in the Royal Navy during WW1 and the Australian Navy in WW2, currently lives in Australia. Frank Buckles is the only American veteran John Babcock is the only Canadia veteran Sadly Henry Allingham died earlier today (18 July) There is another British man who claims to have been in the forces at the end of WW1 but his claim has never been confirmed.

Update 31 Oct 2015

As of 5 May 2011, Claude Choules, the last known confirmed veteran of WWI died today at the age of 110. Harry Patch died, 25 Jul 2009, John Badcock died, 18 Feb 2010, and Frank Buckles died, 27 Feb 2011.