Summary

More than half a million male mosquitoes carrying a parasite called wolbachia have been released in Barcelona. When these mate with females, the eggs won’t hatch, reducing the number of mosquitoes in the city and the risk of people getting mosquito-borne infections, such as dengue. The approach is already being used in Singapore, but this is the first large-scale release in Europe. “In Barcelona, we are talking about the first example of a real introduction in the public spaces of the city,” says Rubén Bueno Mari at pest-control company Rentokil.

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