‘Shocking’ data shows the climate crisis and invasive mosquitos mean chikungunya could spread in 29 countries

An excruciatingly painful tropical disease called chikungunya can now be transmitted by mosquitoes across most of Europe, a study has found.

Higher temperatures due to the climate crisis mean infections are now possible for more than six months of the year in Spain, Greece and other southern European countries, and for two months a year in south-east England. Continuing global heating means it is only a matter of time before the disease expands further northwards, the scientists said.

The analysis is the first to fully assess the effect of temperature on the incubation time of the virus in the Asian tiger mosquito, which has invaded Europe in recent decades. The study found the minimum temperature at which infections could occur is 2.5C lower than previous, less robust, estimates, representing a “quite shocking” difference, the researchers said.