Gene Drive in the News
A curated collection of articles from the popular press
New Gene Drive Stops the Spread of Malaria—Without Killing Any Mosquitoes
35343Shelly Fan, SingularityHub, 2025-12-18 11:51:00.
Mosquitoes are an uncomfortable, itchy nuisance. But for people in sub-Saharan Africa, a bite could mean death. The pests are living incubators for the parasite that causes malaria. Roughly 600,000 people are killed by the disease each year, with most being children under five years of age. Insecticides, malaria drugs, and mosquito nets saved a million lives globally in 2024 alone. But their efficacy is waning. Mosquitoes and the malaria parasite are becoming resistant to chemical inhibitors. And consistent, perfect use of physical barriers is hard to manage for years on end, especially for children. Realizing this, scientists have turned to a drastic solution: Gene drives, a technology that skews the rules of inheritance. Rather than nature’s fifty-fifty chance of an offspring inheriting a gene from either parent, gene drives raise the possibility of a gene’s inheritance to over 90 percent—if not higher. The tweak allows a gene to rapidly spread across entire populations. In lab tests encoding gene drives that reduce female mosquito fertility, mosquito populations have collapsed. Other experimental gene drives encoding genes that block parasite reproduction have suggested they could replace a natural population with one unable to carry malaria in just a few generations.
Spot the males: New gene-editing method could transform mosquito control
35339Robert Egan, Phys.org, 2025-12-17 11:22:04.
Researchers have developed a new "color-coded" genetic method that makes it easy to distinguish male and female mosquitoes. This innovation can help solve a major bottleneck in mosquito control strategies that rely on releasing only sterile males. The approach uses gene editing to produce dark males and pale females, offering a practical and safer alternative to current sex-separation techniques. A new study led by Doron Zaada and Prof. Philippos Papathanos from the Department of Entomology at Hebrew University, introduces a powerful genetic approach for separating male and female mosquitoes, an essential step for large-scale mosquito control programs aimed at reducing the spread of infectious diseases such as Dengue, Zika, and Chikungunya. Mosquito control strategies based on the mass release of males rely on the complete removal of females, which bite and transmit disease. Existing separation methods, largely based on size differences at the pupal stage, are labor-intensive, difficult to scale, and prone to letting biting females slip through. This new study presents a genetically engineered "Genetic Sexing Strain" (GSS) of the Asian tiger mosquito (Aedes albopictus) that allows sexes to be sorted automatically based on visible pigmentation.
Genetic trick to make mosquitoes malaria resistant passes key test
35307Michael Le Page, New Scientist, 2025-12-10 17:06:06.
A genetic technology known as a gene drive could help prevent malaria by spreading genes in wild mosquitoes that stop them transmitting the parasite. Tests in a lab in Tanzania have now confirmed that one potential gene drive should achieve this if it were released in the country. “It would be a game-changing technology, that’s for sure,” says George Christophides at Imperial College London. A specific piece of DNA in the genome of an animal is normally passed on to only half its offspring, because a parent’s DNA is divided in half among egg or sperm. Gene drives increase this proportion, meaning a bit of DNA can spread rapidly through a population even if it provides no evolutionary benefit. There are many natural gene drives that work via all kinds of mechanisms – perhaps even in some human populations – and in 2013, biologists developed artificial gene drives using CRISPR gene-editing technology, which works by copying pieces of DNA from one chromosome to another. The idea is to use these drives to spread bits of DNA that block malaria transmission – but which bits? Christophides reported in 2022 that the development of malaria parasites inside mosquitoes can be greatly reduced by two tiny proteins, one derived from honeybees and the other from the African clawed frog.
This scientist is breeding billions of mosquitoes to fight disease in Brazil
35301Mariana Lenharo, Nature, 2025-12-08 17:09:18.
nside a massive factory in the industrial district of Curitiba, Brazil, millions of Aedes aegypti mosquitoes are breeding in a climate-controlled room filled with mesh cages. Every week, the facility produces more than 80 million mosquito eggs. At the heart of this effort is Luciano Moreira, a soft-spoken agricultural engineer and entomologist, who opened the factory in July as part of an effort to fight mosquito-borne illnesses in the country. At the Curitiba facility, mosquitoes are infected with a bacterium called Wolbachia, which curbs the transmission of harmful human pathogens. Their offspring are being released in Brazilian cities to help to control dengue, a deadly viral disease transmitted mainly by A. aegypti. Until recently, Wolbachia-carrying mosquitoes were released only as part of small-scale research projects. The new factory marks a shift towards nationwide adoption of the method after Brazil’s federal government recognized it as an official public-health measure to combat dengue and other mosquito-borne diseases. People credit Moreira for making the case. “He has succeeded not only in carrying out the academic work, running experiments to demonstrate the model’s effectiveness, but also in convincing political decision-makers to implement the technology,” says Pedro Lagerblad de Oliveira, a molecular entomologist at Brazil’s Federal University of Rio de Janeiro. “This is a skill that not all scientists have.”
Controversial genetically modified mosquito release paused after backlash in Qld
35305Brandon Long, Australian Broadcasting Corporation, 2025-12-05 17:32:24.
A plan to release genetically modified (GM) mosquitoes in Queensland has been paused, with the organisation behind the idea withdrawing its licence application. Oxitec Australia — a partnership between Australia's CSIRO and US biotech firm Oxitec Ltd — aimed to sell its so-called "friendly" mosquitoes to reduce the spread of diseases like dengue. The plan received backlash from scientists, health experts, and the public, but CSIRO said the step back was not due to concerns about the technology. "This decision was not related to concerns about the technology itself, rather a determination made around the early stage of the company and the necessary financial requirements of holding a licence," a CSIRO spokesperson said.
UCMI partners with Equatorial Guinea to advance the fight against malaria
35265Ana Kormos, Outreach Network for Gene Drive Research, 2025-10-30 17:22:36.
The University of California Malaria Initiative (UCMI) announced a new partnership with the Government of Equatorial Guinea on the sidelines of the United Nations General Assembly (UNGA), which took place in New York City in September. The partnership will support the implementation of Equatorial Guinea’s Vision 2030 strategy for malaria elimination. Despite progress in fighting malaria, the disease remains a major public health concern in the country, particularly in rural and under-resourced areas. Building on over two decades of impact through the MCD Global Health’s (MCD) Bioko Island Malaria Elimination Project (BIMEP), this new collaboration will support the Ministry of Health’s ongoing efforts to eliminate malaria. The long-running BIMEP project has achieved a 78 percent reduction in malaria prevalence and eliminated two major mosquito vectors on Bioko Island. As a scientific partner, UCMI will work with the Ministry of Health, National Malaria Control Program, BIMEP and MCD Global Health to advance research and support implementation of new malaria control strategies including the UCMI genetically modified mosquito. Drawing on its expertise in vector and malaria control research, UCMI will contribute to the advancement of innovative malaria control tools and strategies to ensure that Equatorial Guinea benefits from the latest scientific developments and best practices in full alignment with national priorities and community engagement.
Malaria Know More: Behind the Science of Gene Drive with Krystal Birungi
35271Malaria No More, 2025-10-29 17:39:23.
Congratulations on being named a 2025 Goalkeepers Champion by the Gates Foundation! What does this acknowledgement mean to you personally and professionally as an advocate for malaria elimination? BIRUNGI: It was pretty exciting and also very validating. Malaria has been around for so long that, for many people, it can seem like it’s no longer a big deal. It’s incredible how it can be glossed over that we’re losing over half a million people a year to a disease that we’ve been fighting for decades. You don’t often get recognized for work in this field, so it means a lot to have something I’m working towards be acknowledged. I was also delighted that this brought such a large platform to the fight against malaria. It has helped draw more attention to what we’re doing, why we’re doing it, and the potential it holds to defeat the disease. This year’s Goalkeepers event and being named a champion, is something I’m incredibly grateful for – not just for myself, but for the impact that it can have for malaria.
Innovation under pressure: bold ideas for a changing malaria landscape
35253Epstein, A., Tangena, JA., BMC Glob. Public Health, 3. 2025-10-27 10:36:07.
Innovation has never been more urgent. Encouragingly, the malaria research community is responding. Next-generation insecticide-treated nets (ITNs) [1], new indoor residual sprays (IRS) [2], and spatial emanators are reaching communities [3]. Vaccines such as R21 and RTS,S are moving from trials into wider use [4, 5]. On the treatment front, the pipeline now includes long-lasting antimalarials [6], triple combination therapies (TACTs) [7], and single-dose drugs like tafenoquine [8]. Novel approaches such as ivermectin, recently shown to reduce malaria incidence when deployed in mass drug administration campaigns, are also gaining traction [9]. Looking further ahead, early breakthroughs in gene drive in mosquitoes to bias inheritance of a specific genetic trait (like sterility or resistance to malaria) is passed on to offspring, and monoclonal antibodies, which point to bold new frontiers [10, 11]. Together, these advances represent the most significant broadening of the malaria toolkit in decades. But innovation alone will not be enough. The momentum is colliding with deep structural challenges. Funding cuts threaten to derail the rollout of new tools. Resistance is mounting: mosquitoes have developed resistance to most insecticides used for vector control, and parasites are showing reduced sensitivity to artemisinin and even lumefantrine, a key partner drug to control artemisinin resistance, in East Africa [12]. Climate change is redrawing the risk map by shifting mosquito habitats. Health systems remain fragile, weakened by COVID-19, extreme weather, and political unrest. Even when technologies are available, their potential can be weakened by regulatory delays, fragmented governance, or inequities in access and limited community trust. The path forward requires more than breakthroughs in science. Sustained progress will depend equally on the strength of delivery systems, stable financing, and governance that can translate innovation into equitable impact.
Reactions as IUCN Congress votes to adopt Policy on Synthetic Biology, rejects genetic engineering moratorium
35245EnvironNews Nigeria, 2025-10-15 09:12:00.
Following the vote at the IUCN World Conservation Congress, members have rejected a moratorium on genetic engineering of wild species (Motion 133) and adopted the IUCN Policy on Synthetic Biology (Motion 087), a move observers see as a signal of support for a science-based, case-by-case approach to innovation in conservation. The Outreach Network for Gene Drive Research has welcomed the outcome as a vote of confidence in scientific collaboration and evidence-led policymaking. In a statement, the Outreach Network for Gene Drive Research said: “As a coalition that champions the value of responsible research, we welcome the adoption of IUCN’s Policy on Synthetic Biology as a constructive, balanced and science-based approach towards the potential application of this emerging field for conservation. “The escalating biodiversity crisis poses a grave threat to the future of all life on earth, with more than a million species at risk of extinction. Synthetic biology, including genetic engineering, offers new hope for solutions that can rise to the scale and urgency of the challenge.
Cattle Q&A with Brinda Dass, GeneConvene Global Collaborative
35243Tyrell Marchant, Progressive Cattle, 2025-10-15 08:41:35.
What factors have led to the northward spread of New World screwworm (NWS) over the past year after so many decades of successful eradication in Mexico and the U.S.? DASS: The northward spread of NWS after decades of eradication reflects a convergence of biological, environmental and programmatic factors. Climate change and increasing temperatures have created favorable conditions for pupal survival and year-round reproduction, enabling rapid reinvasion from subtropical regions. NWS biology – especially females’ ability to lay multiple waves of eggs in wounds – allows populations to surge quickly even from small footholds. High-density livestock practices and insufficient inspection of animal trade further accelerate spread, with smuggling through the Darién Gap undermining surveillance. Wildlife, pets and humans act as reservoirs, compounding detection challenges. Sterile insect technique (SIT), historically successful, has been overwhelmed: Production of sterile flies cannot match population growth, forcing control lines northward. Budget constraints, political disputes and reduced funding have further weakened monitoring and response systems. Together, these dynamics explain how a long-maintained eradication barrier collapsed, allowing NWS to expand northward at alarming speed.
Should genetically modified wildlife be banned? Scientists weigh the risks
35235Mariana Lenharo, Nature, 2025-10-10 16:01:10.
The global conservation community is debating whether to ban the release of genetically modified organisms into the wild. Dozens of non-governmental organizations have called for a moratorium on field applications of synthetic biology — a technology being studied as a tool to fight diseases, control pests and help endangered species — saying that the approach has unpredictable consequences. But some researchers argue that an outright ban is too restrictive, and could have negative consequences for human health and biodiversity. A proposal for a ban will face a vote next week at a congress of the International Union for Conservation of Nature (IUCN) in Abu Dhabi. The IUCN brings together governments and civil-society organizations to guide global conservation policy. Although decisions made by its members are not legally binding, they do influence legislation in many countries, says biologist Piero Genovesi, head of the Wildlife Service at the Italian Institute for Environmental Protection and Research in Rome. If members vote in favour of the proposed ban, it “could have stronger impacts in areas like Europe or Australia, where there are many lines of research focused on developing new tools based on synthetic biology for improving the efficacy of conservation action”, Genovesi says. He is among more than 240 scientists who have so far signed an open letter asking IUCN members to reject the moratorium.
UC Malaria Initiative Expands Activities to Equatorial Guinea
35209Andy Fell, UC Davis, 2025-10-01 14:52:44.
The University of California Malaria Initiative, which includes researchers at UC Davis, will partner in the Republic of Equatorial Guinea’s Vision 2030 strategy to eliminate malaria from the Central African country. The plan, which also includes Oxford University, Tsinghua University and a MCD Global Health, was announced Sept. 24 during the United Nations General Assembly in New York. Vision 2030 builds on 20 years of experience in malaria control on Bioko island, Equatorial Guinea. This effort has led to a 78 percent reduction in malaria transmission and eliminated two major mosquitoes that transmit the disease. The program will include R21, a malaria vaccine developed at Oxford. It will also include a range of proven malaria control measures and health interventions. UCMI is focused on using genetically modified mosquitoes to eliminate malaria transmission. It is led by Professor Anthony James, Donald Bren and Distinguished Professor of Microbiology and Molecular Genetics at UC Irvine. Professor Gregory Lanzaro, Department of Pathology, Microbiology and Immunology at UC Davis School of Veterinary Medicine, is leading the translational component of this program and established a field site in the Democratic Republic of São Tomé and Príncipe, and island nation off the coast of Central Africa, where he and his team have been working since 2018. They will now expand this work in Equatorial Guinea. “We are pleased to partner with the Government of Equatorial Guinea in their pioneering malaria elimination program," Lanzaro in a news release. "Our mission is to support countries in achieving malaria elimination through responsible science, deep collaboration, and genuine community engagement. Together, we can help build a future where malaria is no longer a threat to families and communities across the region."
Biotechnology Is a Powerful Tool for Conservation
35205Emma Kovak, The Ecomodernist, 2025-09-30 15:40:23.
What do the American Chestnut tree, the black rat, and the northern white rhinoceros have in common? They are all prime targets for conservation through biotechnology. Genetic engineering could give American chestnut trees disease resistance and restore the keystone species to Eastern forests, gene drives could eliminate rats from islands and save seabirds from the invasive predators, and assisted reproduction technology could rescue the Northern white rhinoceros from the brink of extinction. The U.S. Department of Agriculture is poised to approve an American chestnut engineered to resist the blight that functionally eliminated the species from Eastern forests. Meanwhile, the International Union for Conservation of Nature (IUCN)—the world’s largest conservation network—is voting on whether to ban biotechnology outright or recommend thoughtful case-by-case evaluation. These decisions are important determinants of biotechnology’s role in the conservation toolkit. With extinction rates accelerating, conservation efforts should be able to use as many tools as possible.
From fear to leadership: Africa must embrace innovation instead of blocking it
35187Patricia Nanteza, The Observer, 2025-09-27 08:47:22.
In Burkina Faso, the Target Malaria project, a global research consortium aiming to use genetically modified mosquitoes to combat malaria, has faced a major setback. On August 18, 2025, judicial police raided the Research Institute in Health Sciences (IRSS), a key partner in the project. This raid, which scientists described as “brutal” and “humiliating”, involved sealing off offices and laboratories and treating researchers like criminals, searching even their vehicles for mosquitoes! This event occurred just one week after the project had celebrated a milestone on August 11, releasing about 16,000 genetically modified male mosquitoes in the village of Souroukoudingan, the first such release in Africa. The raid prompted Burkina Faso to announce the immediate suspension of all project activities. The Target Malaria project aims to combat malaria by using a gene drive to spread desirable genetic modifications in mosquitoes. The goal is to reduce the number of female Anopheles gambiae mosquitoes, as they are the ones that transmit malaria to humans. This can be achieved by introducing genes that produce enzymes which disrupt specific genes, such as those controlling fertility or sex determination. Since the genetic changes are self-sustaining and inheritable by a high percentage of offspring, the intervention offers a potentially cost-effective and sustainable solution for malaria control. For a country that records over 40,000 deaths from malaria each year, this pause was more than just a political decision – it was a health crisis delayed. The suspension, which followed years of preparation and a previous release of sterile mosquitoes in 2019, was a sobering reminder that Africa, while being the continent most affected by malaria, can also be the first to step back from promising innovations.
Genetically engineered mice could take the bite out of Lyme disease on Nantucket, scientists say
35149Jon LaPook, Denise Schrier Cetta, Aliza Chasan, Katie Brennan, CBS News, 2025-09-21 10:07:27.
Over the past 40 years, Dr. Timothy Lepore has been the emergency room head, sole surgeon and medical examiner on Nantucket, a small island off Cape Cod, Massachusetts. Today he runs the only private practice, where he treats dozens of patients with Lyme disease each year. About 15% of residents on the island have been afflicted with the disease, which can cause a wide range of symptoms like a fever, rash, facial paralysis, an irregular heartbeat and arthritis. Lepore, 80, may finally be able to retire if a team of scientists' dream to curb the transmission of Lyme disease on the island becomes a reality. The scientists' target is not the deer or ticks often associated with the disease: it's wild mice, the main host of Lyme bacteria. The hope is that by genetically engineering mice to be immune to Lyme and releasing them in Nantucket, the population of mice able to spread Lyme disease on the island will shrink. The problem on Nantucket can be traced back to 1926, when the community voted to import two female deer to the island to give a lone buck company. On top of that, by the 1950s, half the land on the island was put into conservation. The untamed brush and wild grasslands create an ideal ecosystem for Lyme's hosts to thrive. As the deer population grew, so did the population of ticks. Deer don't get Lyme, but female ticks feed on them, and then lay as many as 2,000 eggs in a single batch. Deer also spread the disease as thousands of them carry ticks across Nantucket. Not all ticks carry Lyme disease, and a tick bite doesn't guarantee the transmission. Even if the tick is carrying Lyme, the tick has to be attached for more than 24 hours to infect someone.
How billions of hacked mosquitoes and a vaccine could beat the deadly dengue virus
35143Lucila Pinto, Nature, 645:578-580. 2025-09-17 14:21:03.
Last month, a parade of vehicles wound its way through three cities in Brazil, releasing clouds of mosquitoes into the air. The insects all carry a secret weapon — a bacterium called Wolbachia that lowers the odds that the mosquitoes can transmit the dreaded dengue virus to humans. These infected mosquitoes are the latest weapon in Brazil’s fight against dengue, which infects millions of people in the country each year and can be fatal. A biofactory that opened in the town of Curitiba in July can produce 100 million mosquito eggs per week — making it the largest such facility in the world. The company that runs it, Wolbito do Brasil, aims to protect about 14 million Brazilians per year through its Wolbachia-infected mosquitoes. That will come as welcome news for the Brazilian health officials battling the rapidly growing threat of dengue. In 2024, the country experienced its worst outbreak yet: with 6.6 million probable cases and more than 6,300 related deaths. This year’s outbreak, although less severe, is also one of the highest on record, with 1.6 million probable cases so far (see ‘Dangerous outbreaks’). And the problem is spreading. Argentina, Colombia and Peru also experienced record-breaking outbreaks in 2024 and have seen a sustained increase in cases in recent years. Across Latin America and the Caribbean, deaths from dengue last year totalled more than 8,400 and the global figure reached more than 12,000 — the highest ever recorded for this disease.
Fruit fly tests in Greece target invasive species threat
35161Vassilis Kyriakoulis, Phys.org, 2025-09-15 15:24:50.
In a small persimmon orchard in northern Greece, scientists carefully open paper bags to release thousands of flies, in an experiment aimed at blunting the destructive impact of invasive new species. The insects are sterile male Mediterranean fruit flies (Ceratitis capitata), a pest that annually causes significant damage to crops in Naousa, where a large proportion of Greece's prominent export, the peach, is produced. But the project is ultimately aimed at curbing an even greater threat: fruit fly species from Asia, which have begun to make their appearance in southeastern Europe as climate change increases local temperatures. The four-year, EU-funded project titled REACT brings together researchers from 12 different countries including the UK, Israel and South Africa. The program has a budget of 6.65 million euros ($7.8 million). "Our approach is to locally eradicate Mediterranean fruit fly populations and then apply this knowledge to other species of interest, such as the oriental fruit fly and the peach fruit fly," said project participant Nikos Papadopoulos, a professor of Applied Entomology at the University of Thessaly. The male flies are grown at the University of Patras and are fed a bacterial supplement that makes them more active, resilient, and competitive, said George Tsiamis, the university's Laboratory of Microbiology Systems director, during a media tour organized in Naousa by the research team.
Mosquito gene drive cancellation disrupts Africa’s malaria research
35139Esther Nakkazi, Nature Africa, 2025-09-12 15:46:02.
The abrupt suspension of an anti-malarial gene drive project in Burkina Faso has disrupted plans by scientists in Uganda working on their own modified mosquitoes. The Target Malaria project was put on hold by Burkina Faso’s government in August. Facilities holding genetically modified mosquitoes were sealed, and all samples ordered to be destroyed. Male mosquitoes released in a village were also neutralised with insecticides. A gene drive sees the release of a modified species with the aim of the modification being passed to the next generation, allowing its frequency to increase rapidly in a population. The project’s freeze casts doubt on other programmes across Africa. Jonathan Kayondo, principal investigator at Target Malaria Uganda, said scientists had not anticipated the decision. “It’s surprising, because Burkina Faso scientists had gone through all the regulatory approvals and were given the go-ahead. They were not operating illegally.” For Ugandan researchers, the termination threatens to disrupt timelines, reshape field study plans, increase costs, and denies the opportunity to build on data gathered. Target Malaria is a not-for-profit international research consortium, aiming to develop genetic technologies to reduce populations of malaria-transmitting mosquitoes in Africa. Since 2012, it has operated at the Research Institute in Health Sciences (IRSS) in Bobo Dioulasso, Burkina Faso, with funding from the Gates Foundation. In 20191, the Burkina Faso team had released a small, non-gene-drive strain of genetically modified mosquitoes, whose strains carry useful traits such as reduced fertility. The modifications were not preferentially inherited, and disappear naturally over generations.
After ‘humiliating’ raid, Burkina Faso halts ‘gene drive’ project to fight malaria
35111Kai Kupferschmidt, Science, 2025-09-03 09:35:57.
On 11 August, the international nonprofit Target Malaria celebrated a milestone: In the village of Souroukoudingan, Burkina Faso, its researchers released about 16,000 male mosquitoes genetically modified to produce almost exclusively male offspring. The release, the first of its kind in Africa, was part of a project supported by the Gates Foundation that aims to rid the world of malaria using a so-called gene drive, a controversial technique to help desirable genes spread through a population fast. But a week later, that dream suffered a major setback. On 18 August, judicial police showed up at the Research Institute in Health Sciences (IRSS) in Bobo-Dioulasso, a key partner in Target Malaria, to stage what scientists described as a “brutal, humiliating” raid. According to minutes of a 26 August meeting between researchers and the country’s science minister, IRSS scientists were “treated like criminals, with their offices and laboratories sealed and marked as crime scenes.” The minutes noted that “everyone was searched, including their vehicles, on the grounds that researchers might be carrying mosquitoes in their pockets.” Four days later, the government suspended all of Target Malaria’s activities in Burkina Faso indefinitely. IRSS scientists killed the mosquitoes still living in their insectary, and the government sent a team to spray insecticides in Souroukoudingan to kill the mosquitoes released there.
This is the world’s largest ‘mosquito factory’: its goal is to stop dengue
35109Mariana Lenharo, Nature, 2025-09-03 09:20:02.
When biologist Antonio Brandão tells people that he works at a mosquito factory, they are often baffled. Why would you make more mosquitoes?, he recalls people asking. “We have enough of them.” But once he explains that the laboratory-raised insects can help to stop the spread of dengue — which strikes hundreds of thousands in Brazil each year with fever, headache and bone pain — they come around. Brandão is the production manager, not at just any mosquito factory, but at the world’s largest, located in the southern Brazilian city of Curitiba. Launched in July, the facility is expected to produce 100 million eggs a week from the mosquito Aedes aegypti. However, unlike wild A. aegypti, the main transmitter of dengue virus, those churned out by the factory carry a harmless Wolbachia bacterium that curbs the insects’ ability to spread viruses including dengue and Zika. The idea is to release the modified mosquitoes, which researchers call wolbitos, into cities in Brazil, where they will mate with their wild counterparts and the females will pass the bacterium on to their offspring, gradually converting the local population. The wolbito strategy, which is being spearheaded by the non-profit World Mosquito Program (WMP), has already shown success in Colombia, Indonesia and at home: in the Brazilian city of Niterói in the southeast, dengue cases dropped by 69% in areas where Wolbachia-carrying mosquitoes were released, compared with areas where they weren’t1. Brazil’s federal government has adopted the approach to fight dengue infections — which surged to a record 6.5 million confirmed cases in the country last year — alongside other preventive measures such as vaccines.
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