China is carrying out its most challenging containment operation since COVID-19, using surveillance drones, mass insecticide spraying, and electricity shutoffs to contain a chikungunya virus outbreak that has now reached other countries.

The virus is transmitted by infected mosquitoes, so China is using giant "compulsive killers", known as elephant mosquitoes, whose larvae "devour" the Aedes mosquito, which passes chikungunya to people, said The Telegraph.