In Brazil’s city of Campinas, scientists have built the world’s largest mosquito factory, capable of producing 190 million mosquitoes per week. These insects are infected with the Wolbachia bacterium, which naturally prevents them from transmitting viruses like dengue, zika or chikungunya. When Wolbachia-carrying mosquitoes are released, the bacteria spread through the wild population, making it harder for the virus to multiply inside the insects. This replacement strategy is aimed at establishi