Montreal, Quebec — On Friday, August 7, 2026, American companies began releasing hundreds of thousands of sterile mosquitoes into the environment around the city. The releases are intended to suppress populations of the invasive tiger mosquito, a known carrier of dengue, chikungunya and Zika viruses.
The operation targets the Aedes albopictus species, commonly called the tiger mosquito, which has become established in Quebec and is capable of transmitting several viral illnesses to humans. By introducing large numbers of male mosquitoes that are unable to reproduce, the companies aim to reduce the overall mosquito population and thereby lower the risk of disease transmission.
Étienne Normandin of the Institut de recherche en biologie végétale de l'Université de Montréal is monitoring the program. Normandin confirmed that the released insects are part of a biological control strategy that has been used in other regions to manage vector populations without relying on chemical insecticides. The research institute is tracking mosquito numbers and disease incidence as the release program progresses.
The initiative comes as public health officials in Quebec continue to assess the threat posed by the tiger mosquito, which arrived in the province in recent years and has adapted to the local climate. While the insects themselves do not cause disease, their ability to spread dengue, chikungunya and Zika has prompted authorities to consider integrated control measures.
The American firms involved have not disclosed the exact number of insects released beyond the estimate of "hundreds of thousands," nor have they provided details on the timing or geographic scope of future releases. The effort represents a collaborative approach between private industry and academic researchers to address an emerging public health concern in the region.