The tiny bugs, which can be found in hotels, planes, public transport and homes, have been multiplying for years.
Their reproductive cycle speeds up in warm weather from 21 days to nine days, according to David Cain, of exterminators Bed Bugs Limited.
He said: ‘The problem has been spreading globally since the late 1990s, and there is literally no country on the face of the planet that hasn’t had a bedbug problem.
‘In the UK there has been a year-on-year increase since 2006, which shows no sign of plateauing. And in the next month or two, we will see a ramping up of activity related to the higher temperatures, which make breeding massively more efficient.’
He added: ‘This insect has developed to be the most efficient and adaptive hunter of human beings that we’ve probably ever had. If people are fearful of sharks, the answer is to stay out of the water. When it comes to bedbugs, the answer is to be permanently on guard.’
Mr Cain warns people against sitting down on public transport, as he believes that is how bedbugs can transfer into the home.
Hotels across the world have been found to have bedbugs, with even five star hotels in Manhattan, New York, found to be infested.
Tony Lewis, head of policy at the Chartered Institute of Environmental Health, told the Observer: ‘It doesn’t matter if they’ve been staying in a five-star hotel or a dingy B&B, the chances of encountering bedbugs are equal.’