Mosquito Factories: Fighting Dengue Fever – DW
Dengue Fever: A Global Health Crisis Escalates
Table of Contents
Published August 21, 2025
Teh Rising Threat of Dengue
Dengue fever is rapidly becoming a major public health concern worldwide. In 2023, a staggering 13.06 million cases were reported globally, according to data from the Pan American Health Association (PAHO). the situation worsened in 2024, with 22,907 severe cases and a tragic 8,348 deaths attributed to the virus.
transmitted by the Aedes aegypti mosquito, dengue is particularly prevalent in countries like Brazil, Colombia, Costa Rica, El Salvador, and Mexico. Gabriel Parra-Henao, director of the Health Research Center for the Tropic (CIST), highlights that the surge in cases is linked to several factors, including strained healthcare systems and inadequate vector control measures.
Underlying Causes: Beyond the Bite
The increase in dengue cases isn’t solely a medical issue.experts point to broader societal and environmental factors.Poor urban planning, particularly in rapidly growing peripheral areas, contributes to the problem. A lack of reliable water infrastructure forces communities to store water, creating ideal breeding grounds for the Aedes aegypti mosquito. As an advisor to the World Health Organization (WHO) explained,these stagnant water sources become “hatcheries for vectors.”
Compounding these issues is the escalating impact of climate change. Rising temperatures are expanding the geographical range of the mosquito, allowing it to thrive in regions where it was previously absent, including parts of Europe, North America, and South America like Argentina and Uruguay.
Brazil at the Epicenter
Brazil is currently facing the brunt of the dengue crisis. The contry accounts for roughly a tenth of all global dengue cases and a staggering 90% of its population is at risk of infection. 2024 marked the worst year on record, with over 10 million probable cases and 6,297 fatalities.
In response, Brazil is investing heavily in both preventative measures and treatment options, including the advancement of vaccines. While vaccines have proven effective against diseases like yellow fever, thier availability for widespread dengue immunization is still limited, remaining in the trial phase.
Innovative Solutions: Fighting Mosquitoes with Mosquitoes
Beyond customary methods, innovative approaches are gaining traction. One promising strategy involves utilizing the bacterium Wolbachia. When introduced into the Aedes aegypti mosquito, Wolbachia blocks the replication of the dengue, Chikungunya, and Zika viruses, effectively reducing the mosquito’s ability to transmit disease.
The places where stagnant water is gathered are the home of the mosquito larvae that causes dengue. Water in containers, pots or vases can house Aedes aegypti.
Image: Gustavo Basso
Companies like Oxitec are pioneering “mosquito factories” that breed Aedes aegypti mosquitoes carrying Wolbachia. Releasing these mosquitoes into affected areas allows them to interbreed with the local population,gradually replacing the disease-carrying mosquitoes with those that are unable to transmit the virus. This “Wolbachia replacement technology” has demonstrated success in reducing dengue transmission in treated communities. Oxitec aims to protect one billion people from dengue by 2040 with this approach.
A large-scale biofactory, Wolbito do Brazil, inaugurated in Curitiba, is capable of producing approximately five billion mosquito eggs per year. This project is a collaboration between the World Mosquito Program (WMP),Fiocruz,and the Institute of Molecular Biology of Paraná (IBMP). Initial results in the city of Niterói have been encouraging, with a important reduction in dengue incidence after implementing the Wolbachia program.
A Holistic Approach is Crucial
While these technological advancements offer hope,experts emphasize the need for a complete,integrated approach to dengue control. Gabriel Parra-Henao advocates for “integral strategies that allow intra and intersectoral actions,” aligning with recommendations from the WHO and PAHO.This includes strengthening healthcare systems, improving urban planning, ensuring access to clean water, and promoting community engagement.