A laboratory in Valencia, Spain, is tackling the spread of dengue fever and other diseases by breeding and sterilizing thousands of tiger mosquitoes, which are becoming more common due to climate change. Warmer temperatures are creating perfect conditions for these mosquitoes to spread across Europe. The Biological Pest Control Centre in Valencia, funded by the regional government, has started a large-scale sterilization program. Every week, around 45,000 male mosquitoes are sterilized with an electron accelerator and then released into the environment. The goal is for these sterilized males to mate with females, which bite humans and spread diseases. By stopping the females from reproducing, the program hopes to slowly decrease the mosquito population and reduce disease transmission.

This European effort, managed by a laboratory experienced in fruit fly control, is crucial as diseases like dengue, Zika, and chikungunya become more common. Local mosquitoes are used in the program, where scientists separate females from males before sterilizing the males with radiation. The European Centre for Disease Prevention and Control has noted an increase in dengue cases and local outbreaks of diseases like the West Nile virus. The tiger mosquito, Aedes albopictus, is now found in 13 European countries, including Spain. The World Health Organization reported that global dengue cases have risen eightfold since 2000, reaching 4.2 million in 2022, a trend linked to climate change’s impact on mosquito populations.