Federal regulators approved to release GM mosquitos in the Florida Keys in 2021.The idea is to reduce the number of mosquitoes that carry diseases like dengue or the Zika virus.

The green-lighting of a pilot project after years of debate drew a swift outcry from environmental groups, who warned of unintended consequences. One group condemned the plan as a public “Jurassic Park experiment”. Activists warn of possible damage to ecosystems, and the potential creation of hybrid, insecticide-resistant mosquitoes. But the company involved says there will be no adverse risk to humans or the environment, and points to a slate of government-backed studies.

In May, the US Environmental Agency granted permission to the British-based, US-operated company Oxitec to produce the genetically engineered, male Aedes aegypti mosquitoes, which are known as OX5034.

Aedes aegypti mosquitoes are known to spread deadly diseases to humans such dengue, Zika, chikungunya and yellow fever.