France is scrambling to make sure that virus-carrying tiger mosquitos, a growing menace in Europe, don't spoil the Paris Olympics for athletes and fans, with millions of visitors due in the French capital for the summer Games.
The Asian tiger mosquito has made its home in much of northern Europe, including France, over the past two decades, spreading diseases such as dengue, chikungunya and zika.
Climate change is said to be behind its easy adaptation to colder climates, with authorities recently declaring Normandy in the northwest, the last remaining mosquito-free region in all of France, infested just like the rest of the country.
Authorities have tried in vain to get rid of the insects, including by fumigating parts of Paris, a technique regularly used in tropical cities.
But with the start of the Paris Games only four months away, they are on the clock, with experts warning that a tiger mosquito bite could destroy an athlete's chance of making it to the starting line.
"When you are sick with dengue, you won't be jumping over any hurdles," said Didier Fontenille, an entomologist and expert on vector-borne diseases.
"The host cities and especially the Olympic Village must be kept mosquito-free," he said.
'Citizens' mobilisation'
Health authorities have promised "increased surveillance" of the mosquito threat, which has been notoriously difficult to eliminate.
France reported 45 dengue cases last year, attributed to local virus transmission.
Tiger mosquitoes are happiest in cities, where an abundant presence of stagnant water creates ideal conditions for laying their eggs.
The fight against tiger mosquitoes is a flourishing business, with Qista, a French specialist firm, saying it had put up 13,000 anti-insect installations in 26 countries over the past decade.
Researchers are meanwhile working on DNA modification and sterilisation to diminish the mosquito population.
