Gene Drive in the News
A curated collection of articles from the popular press
A viral gene drive could offer a new approach to fighting herpes
32519Meghan Rosen, ScienceNews, 2024-10-15 08:28:16.
The words “herpes” and “spread” in the same sentence don’t typically spell good news. Unless, that is, you’re talking about a busybody new virus. That virus includes designer DNA called a gene drive that spreads from one herpes simplex virus to another. And it may be a first step toward an entirely new way of treating the infection, researchers report September 17 in Nature Communications. For now, the team has shown simply that their gene drive DNA sequence can copy/paste itself into the genomes of other herpes viruses during an infection in mice. But the idea is to one day create a gene drive virus that shuts down herpes simplex infections in people, says Keith Jerome, a virologist at the Fred Hutchinson Cancer Center in Seattle. Jerome ultimately wants to say to patients: “You don’t ever have to worry about this virus again. It’s never going to cause disease. You’re never going to infect another person. It just doesn’t matter to your life anymore.” Though some may consider herpes more annoyance than agony, “these viruses have a tremendous effect on people’s health,” Jerome says. They can cause a huge range of symptoms — some people don’t even know they’re infected while others sprout oozing sores around the genitals or mouth. Current therapies include antivirals, but they just tamp the virus down, they don’t eradicate it. One challenge is that herpes can lie dormant in people’s nerve cells for months or years and then roar awake again, spawning fresh blisters. Infection lasts a lifetime. A therapy that disables the slumbering virus could potentially cure the infection. But how to do it? Marius Walter, a Fred Hutch virologist, remembers reading an article that claimed designing gene drives in viruses was impossible. “That got me thinking,” he says.
Exploring new tools to fight vector-borne diseases: research and governance implications
32541Alekos Simoni, Outreach Network for Gene Drive Research, 2024-10-08 12:24:29.
I recently had the honor and pleasure of attending an event co-organized by the Outreach Network for Gene Drive Research at the European Parliament in Brussels, and delivering a presentation on our work at Target Malaria to develop new genetic tools to reduce malaria transmission in Africa. The event was an opportunity to discuss advancements in the development of gene drive technologies and governance implications related to these new tools. With climate change creating favorable conditions for the spread of disease-carrying mosquitoes, and challenges such as drug and insecticide resistance threatening the efficacy of current interventions, a global, coordinated response is needed to tackle vector-borne diseases. In this context, gene drive technologies could offer a promising addition to existing approaches. MEP Charles Goerens opened the session by highlighting the global burden of vector-borne diseases, such as malaria and dengue, which cause over 700,000 deaths every year. He stressed the importance of innovation to address global health challenges and the critical role of the European Parliament in ensuring responsible oversight of new tools, such as gene drive technologies.
Professor Abdoulaye Diabaté’s frank conversation with Bill Gates
32512African Media Agency, 2024-10-08 09:27:11.
On October 2, 2024, Professor Abdoulaye Diabaté, a prominent figure in malaria research and Head of Medical Entomology at Burkina Faso’s Research Institute in Health Sciences, gained international attention by appearing in the Netflix documentary series "What’s Next? The Future With Bill Gates." The episode, titled "Can We Outsmart Disease?", delves into the ongoing battle against malaria, which disproportionately affects Africa, accounting for 94% of cases and 95% of deaths globally. In his conversation with Gates, Diabaté highlights the critical link between malaria and poverty, arguing that had the disease claimed similar lives in wealthier nations, it would have prompted a more aggressive global response. He advocates for a greater role for African voices in developing innovative solutions to combat malaria, including emerging technologies like gene drive mechanisms aimed at reducing mosquito populations. Despite significant progress, recent reports indicate a worrying increase in malaria cases due to factors such as insecticide resistance and climate change. The documentary underscores the urgent need for sustained investment in malaria research and innovative approaches, a sentiment echoed by Gates, who notes the shocking disparity in funding for malaria compared to other health issues. As the series aims to raise awareness and inspire action, it poses a pressing question: Can we finally outsmart this persistent disease?
10 myths and misconceptions around modified mosquitoes
31627Milliam Murigi, k24, 2024-09-23 21:32:42.
In the fight against mosquito-borne diseases, scientists have turned to groundbreaking genetic technologies to reduce disease transmission. However, Genetically Modified (GM) mosquitoes have raised concerns and sparked myths and misconceptions around it. Abraham Isah, OFAB Project officer, Nigeria demystifies them. There have been allegations that scientists have secret agendas, and that is why they’re pushing for the release of Genetically Modified (GM) mosquitoes. However, the truth, releasing GM is intended to control populations of disease-carrying mosquitoes, such as Aedes aegypti, which spread malaria, dengue, and Zika virus. These mosquitoes are engineered to either reduce the population or make it less capable of transmitting diseases. This approach has been thoroughly tested and regulated by authorities like the Environmental Protection Agency (EPA) and the World Health Organisation (WHO) to ensure safety and efficacy. The primary goal is to reduce disease burden and improve public health, not to impose a hidden agenda.
The ultra-selfish gene
31608Mathias Kirk Bonde, Works in Progress, 2024-09-18 20:59:37.
Almost every cell in our bodies contains 23 pairs of chromosomes, which are packages of the DNA and genes that provide the code for producing living things. Sperm and egg cells, however, each contain only one set of chromosomes. This set of chromosomes has been recombined from their parents’ chromosomes, meaning it contains a random mixture of segments from the parents. When a sperm and egg cell fuse, the resulting cell has a pair of each chromosome once again, resulting in 23 pairs. Because the sections of each chromosome to be passed on were selected randomly, any specific gene in a parent has only a 50 percent chance of making it to the next generation. A gene that helps organisms to have more surviving offspring will gradually become more widespread in the population. But some genes have found ways of overriding this process. For example, what if a gene makes the sperm or egg more likely to inherit the section of DNA where the gene itself is located? In that case, the selection process is no longer random, and the gene can spread across the population even if the gene carries no advantage to the animal’s fitness.
Scientists explore new solutions to fight insecticide resistance, emerging mosquito species
31587Milliam Murigi, People Daily, 2024-09-17 12:05:17.
Africa has long been the epicenter of malaria, battling the deadly disease with a combination of strategies, including insecticide-treated bed nets and indoor spraying. However, the landscape of this fight is rapidly changing. Mosquitoes are increasingly developing resistance to insecticides, undermining these critical interventions. Additionally, new mosquito species, previously not found in certain regions, are now making their presence felt, posing new threats and challenges. But what does the emergence of this double tragedy mean to the continent and what actions are being taken? Dr Willy Kiprotich Tonui, EBS, the Chairman and Executive Director at Environmental Health Safety who also doubles up as the Founder and Head of the Secretariat at the African Genetic Biocontrol Consortium says that the emergence of these challenges means that new solutions must be developed and that is why scientists have been working day and night to come up with new solutions. So far new compounds, DIF-1(+3), which has demonstrated significantly stronger growth inhibitory effects against Plasmodium falciparum have been synthesized, including strains resistant to chloroquine and artemisinin. This compound showed near-complete suppression of parasite growth in vivo tests, indicating its potential as a new treatment option in areas with high levels of drug resistance. “New insights into how malaria parasites invade host cells have also been revealed. This is useful in understanding mechanisms that can aid in developing targeted treatments and vaccines to prevent the parasite from establishing infection in the first place,” says Dr Tonui.
Bill Gates’ Efforts To Eradicate Malaria And The Economic Impact Of Ridding The Globe Of This Disease
31585Kaili Killpack, Yahoo Finance, 2024-09-17 10:18:40.
In a compelling drive to eradicate one of the world’s deadliest diseases, Bill Gates is leveraging his substantial influence and resources to tackle malaria with renewed vigor. His foundation's recent initiatives are centered around a multi-faceted approach that blends cutting-edge technology with grassroots interventions. Gates highlights the strategic investment in next-generation mosquito control methods, such as genetically modified insects that target and disrupt malaria transmission. This ambitious endeavor is complemented by an increased focus on innovative treatments and vaccines, aiming to outpace the disease's adaptability. Gates’ commitment underscores a broader global effort to turn the tide against malaria, demonstrating that through a combination of scientific innovation and dedicated funding, the fight against this ancient scourge is on the brink of a transformative breakthrough.
Understanding gene flow and its implications for gene drive research
31547Outreach Network for Gene Drive Research, 2024-09-16 09:02:52.
Gene flow is the transfer of genetic information from one population to another. Also known as gene transfer or gene migration, it plays a crucial role in the evolution and adaptation of species. Understanding the dynamics of gene flow is essential to assess the potential risks and benefits of gene drive approaches. Gene drive technology works by promoting the inheritance of a selected genetic trait within a population, leading to this trait becoming increasingly common within a specific species over time. Researchers have been studying how to harness this technology to address global challenges, including to control the transmission of vector-borne diseases and populations of invasive alien species which threaten sensitive ecosystems. Gene flow occurs naturally in the environment through two main dynamics: Vertical gene flow happens through mating, transferring genetic traits from one generation to another within a species or between closely related species. It is a natural part of evolutionary processes and plays a significant role in how traits are inherited. Horizontal gene flow involves the transfer of genes through non-sexual routes to unrelated organisms. While more common in bacteria, this type of gene flow is much less frequent in complex organisms. The potential implications of gene flow for gene drive research vary depending on specific circumstances. For example, gene drives could spread beneficial traits to malaria-carrying mosquitoes to help combat the disease. However, researchers must also consider whether the genetic modification could be passed on beyond its target population and, if so, whether it could lead to unintended impacts. Current studies indicate that gene flow between targeted and non-target species is generally unlikely due to genetic and ecological barriers. Despite this low probability, researchers continue to explore and refine gene drive technologies, notably by developing systems with built-in safeguards. These strategies aim to control how far and fast gene drives can spread by designing systems that only activate under specific conditions or within certain populations, or are self-limiting through time.
Is Kenya ready to turn to technology to finally defeat malaria?
31451Brygettes Ngana, Nation, 2024-09-04 21:31:11.
For decades, researchers have tested and refined dozens of methods to combat malaria, striving to outmaneuver the resilient mosquito. From deploying bed nets to developing indoor residual spraying, these strategies have formed the frontline defense against this persistent parasite. Over the years, tactics like sleeping under a treated mosquito net and destroying mosquito breeding areas have become ingrained in our daily lives. Yet, malaria remains one of the deadliest diseases in Africa, claiming nearly 600,000 lives annually, the majority of whom are children under the age of five. The disease is transmitted by the parasite Plasmodium falciparum, found in the female Anopheles mosquito, and thrive in the warm, tropical climates found across much of the continent. The World Health Organization (WHO) indicates that 249 million cases of malaria occurred in just 85 malaria-endemic countries in 2022. Nine out of 10 of these deaths occurred in Africa. Despite the development of new vaccines, and antimalarial drugs, progress in reducing malaria transmission, WHO says, has slowed. Even in some developed countries where it was once a distant memory, the disease is making a comeback.
New genetic-editing technique to alter the traits and fates of wild populations
31454Lori Dajose, CalTech, 2024-09-03 21:38:08.
Gene drives are a common technology used to insert a novel gene into a population—for example, to make mosquitos resistant to malaria. They can also be used to modify existing genes, such as making herbicide-resistant weeds susceptible to herbicides once again or even to suppress invasive populations. However, gene drives often face social concerns and regulatory challenges because they involve the spread of transgenes (genes that have been transferred and integrated into an organism's DNA) to high frequency. The new technique, called an Allele Sail, uses the CRISPR/Cas9 genome-editing technology to introduce a targeted "editor" into a population at low frequency. This editor itself does not increase in frequency as organisms reproduce, however, any organism that mates with an editor-carrying organism will become altered at the genomic position targeted by the editor, passing the altered version (called an allele) of the gene down to its own offspring. In this way, the technique mimics the natural genetic process of passing down genes and mutations, and can be used in a wider range of species than traditional gene drive approaches. "Imagine you have a big room of bouncing balls, most of them white but a few are red," says Bruce Hay, professor of biology and biological engineering. "Any time a red ball—the editor—bumps into a white ball, it turns the white ball pink—the edit. As the balls bounce around, over time, more and more of them turn pink."
Excess Lipids Keep Dengue at Bay
31315Shelby Bradford, The Scientist, 2024-09-03 15:36:36.
The Aedes aegypti mosquito can transmit dengue virus; however, infection with endosymbiotic bacteria from the Wolbachia genus reduces viral transmission from these insects. Consequently, Wolbachia-infected mosquitos are one biocontrol agent used in areas with endemic dengue cases. “We are trying to go backwards now, because the intervention works, but we don’t know how,” said Robson Loterio, a microbiologist at the Burnet Institute and author of a paper published in mBio exploring the mechanism of Wolbachia’s antiviral activity. The findings can help researchers prevent viral escape from this biocontrol method. Loterio and his team infected A. aegypti cells with antiviral Wolbachia strains. Using transmission electron microscopy and confocal microscopy, they showed that these bacteria predominantly clustered at the cell’s endoplasmic reticulum (ER). The ER produces molecules used in lipid droplet synthesis. Since both Wolbachia and dengue rely on lipid metabolism, the team investigated the effect of Wolbachia on droplet formation during viral infection by comparing antiviral Wolbachia-infected cells to Wolbachia-free cells. Lipid droplets accumulated in both types of cells, but cells with the bacteria had more lipid accumulation.
What if GM mosquitoes could help limit the tiger mosquito population?
31311Anonymous, All News Press, 2024-09-03 15:23:03.
What if the fight against the tiger mosquito, this invasive species originating from Southeast Asia and established in France for about twenty years, was not totally lost in advance? The exploratory project of Éric Marois, research officer Inserm, within the Institute of Molecular and Cellular Biology (CNRS) in Strasbourgoffers some hope. This fundamental biology researcher explains to 20 Minutes that thanks to Crispr/Cas9 molecular scissors it is possible to cut DNA at a specific location to create a transgenic mosquito. This will either transform female tiger mosquitoes into males or make their offspring sterile. To sort the insects thus modified, they are made fluorescent in the laboratory. An update on this work, funded for at least four years by the national research agency and which could make headlines in the coming years. Genetic engineering, or the idea of using genetic elements to modify the characteristics of mosquitoes, dates back to the 1960s. But at the time, there were no tools at all to carry it out in the laboratory. It was in 2012, with the discovery of the Crispr/Cas9 molecular scissors, which earned Emmanuelle Charpentier and Jennifer Doudna the Nobel Prize in Chemistry, that its application was truly made possible. It involves artificially producing a guide RNA (as exists in nature) and thus directing the Cas9 protein to a chosen DNA sequence within the desired genome.
Scientists want to use mosquito stomach bacteria to end malaria
31201Chia-Yu Chen & Shüné Oliver, Alliance for Science, 2024-08-27 14:05:18.
The months of September to May are an unfortunate season in South Africa: malaria season. The mosquito-borne disease is found in the north-eastern districts of KwaZulu-Natal, Mpumalanga and Limpopo provinces. There are fewer malaria cases in South Africa compared to other African countries. The World Health Organization estimated there were over 10 million cases of malaria in Mozambique in 2022. South Africa, that country’s neighbor, recorded 5,183 malaria cases between September 2022 and August 2023. Its relatively low case numbers may be a result of South African health authorities’ excellent work in controlling the disease (control efforts began more than 120 years ago). The last major malaria outbreak in South Africa was in 2000, when more than 60,000 cases were recorded. Also notable was the 2017 outbreak, with 28,264 cases. This combination of control efforts and low numbers may mean that South Africans think malaria is not something they need to worry about unless they travel to provincial hotspots in the months of September to May. But it remains a disease of concern – not just within the country’s borders, but in the broader southern African region. Many researchers like ourselves are working towards eliminating or even, one day, totally eradicating the disease. “Elimination” doesn’t mean there will be no malaria in the region at all. Instead, it would mean that local mosquitoes no longer spread the disease in South Africa. The reason that South Africa has not fully eliminated malaria is precisely because its local mosquito populations are still transmitting the disease. In fact, in 2023, about 17 percent of people who got sick from malaria had caught it in South Africa and not from travelling to neighboring African countries. Scientists are using and developing many different “weapons” in the fight against malaria. Our approach involves using mosquitoes’ own gut bacteria to prevent them from spreading malaria. This is a form of biocontrol, which involves the use of living organisms or natural substances to control harmful pests. The groundwork we’re laying with this ongoing research will, we believe, allow us and other scientists to create a powerful malaria-beating tool.
Malaria & Dengue; distinguishing mosquito-borne diseases
31178Grace Matheka, HapaKenya, 2024-08-25 20:26:45.
World Mosquito Day is commemorated every year on the 20th of August. The day brings an opportunity to raise awareness on the dangers posed by mosquito-borne diseases like malaria and dengue, and the ongoing efforts to combat them. Both malaria and dengue are transmitted by female mosquitoes and cause severe illness in humans. The two diseases have some similarities, and mosquito species are often confused by patients and medical personnel. Malaria is a leading cause of death in the world, with 200 million cases reported every year worldwide, leading to 600,000 deaths. Most of these deaths happen in Africa, affecting children and pregnant women most. In 2022, WHO reported that Africa was home to 94% of malaria cases at 233 million and 95% at 580 000 of malaria deaths. Children under five accounted for about 78% of all malaria deaths.
Could X Centromeric Drive Underpin PCOS, Miscarriage and Other Age-Related Reproductive Issues?
31176Rhianna-lily Smith, Technology Networks, 2024-08-25 20:13:11.
One of the most prevalent conditions is polycystic ovary syndrome (PCOS), affecting 8-13% of women of reproductive age. Characterized by irregular menstrual cycles, excess androgen levels and ovarian cysts, PCOS is one of the leading causes of infertility. Despite its commonality, the underlying causes of the condition remain poorly understood. Dr. Tom Moore, a principal investigator in the School of Biochemistry and Cell Biology at University College Cork, has proposed a new hypothesis that may explain why human female reproduction is prone to multiple disorders. The X chromosome’s involvement in meiotic drive mechanisms could be a key factor in understanding why certain reproductive disorders are so common and persistent. Meiotic drive refers to a genetic phenomenon where certain genes manipulate the process of meiosis to increase their transmission to the next generation, often at the expense of other genes. In normal meiosis, genes have a 50% chance of being passed on to offspring, but meiotic drive skews this process, allowing "selfish" genes to be inherited more frequently than would be expected by chance. Due to genetic hitchhiking, this can introduce traits that may have detrimental effects on individual fitness. Antagonistic selection is an evolutionary concept where a genetic trait, which is beneficial in one context but harmful in another, may be passed on to a future generation. This typically occurs when a gene has different effects at different stages of life or under different environmental conditions. In the context of human evolution, antagonistic selection can help explain why certain reproductive disorders, like PCOS, might persist.
Genetically Modified Wolbachia mosquitoes help reduce virus transmission
31461Precision Vaccinations, 2024-08-20 10:33:21.
Every year on World Mosquito Day, diseases spread by mosquitoes, which account for over 17% of all infectious diseases and lead to more than 700,000 deaths annually, are highlighted. Parasites, bacteria, or viruses can cause these diseases, including chikungunya, malaria, dengue, Zika, and yellow fever. While some diseases can be prevented with innovative travel vaccines, some can not. This is why the World Mosquito Program exists today. According to the World Mosquito Program, the Wolbachia method is vital in fighting mosquito-borne diseases and protecting communities worldwide. This program can reduce the number of Aedes aegypti mosquitoes. When male Ae. aegypti mosquitoes with Wolbachia mate with wild female mosquitoes that do not have Wolbachia. The eggs will not hatch. Because the eggs don't hatch, the number of Ae. aegypti mosquitoes decreases. They do this by breeding with wild mosquitoes until, over several generations, they replace the local mosquito population. This means Wolbachia mosquitoes help decrease the risk of dengue, Zika, chikungunya, and yellow fever outbreaks. The World Mosquito Program is currently operating in 13 countries—Australia, Brazil, Colombia, Indonesia, Sri Lanka, Honduras, Laos, Vietnam, Kiribati, Fiji, Vanuatu, New Caledonia, and Mexico—and protects more than 11.4 million people. In the United States, communities in Texas, Florida, and California have released mosquitoes with Wolbachia over the past seven years and a significant decrease in Ae. aegypti mosquitoes have been reported. In 2023, the state of Hawaiʻi also launched a Wolbachia program. Most importantly, the U.S. CDC says no data suggests that Wolbachia bacteria harm people, animals, or the environment. Let's hope locally-acquired chikungunya, dengue, and malaria cases soon become distant memories as disease-carrying mosquitos disappear.
Scientists’ novel technology to conserve mosquitoes
31459Milliam Murigi, People Daily, 2024-08-20 09:24:48.
As the world celebrates World Mosquito Day today, scientists have introduced a revolutionary technology that could conserve mosquitoes instead of killing them while eliminating some of the diseases transmitted by mosquitos. Known as gene drive technology, this innovative approach promises to eliminate malaria one of the diseases that is transmitted by mosquitos without harming the mosquito population a crucial aspect that could make this solution both effective and environmentally sustainable. “Gene drives have been successfully tested in laboratory settings to reduce mosquito fertility and spread resistance genes against the malaria parasite. There are field trials and pilot studies underway to test the effectiveness and safety of gene drives in real-world environments,” says Dr Willy Tonui. Tonui, the Chairman and Executive Director at Environmental Health Safety (EHS Consultancy Ltd) also doubles up as the Founder and Head of the Secretariat at the African Genetic Biocontrol Consortium.
New genetic editing technique can modify wild populations with less risk
31062Macquarie University, Phys.org, 2024-08-14 09:44:13.
A new technique developed by researchers from Macquarie University and the California Institute of Technology could allow scientists to more safely alter the genetic makeup of wild populations. The study is published in the journal Nature Communications. The researchers have proposed a new technique that aims to address some of the regulatory challenges and public concerns associated with existing genetic modification methods. Lead author Dr. Maciej Maselko from Applied Biosciences at Macquarie University says the technique, called an Allele Sail, would allow beneficial genetic changes to spread through a population without leaving "foreign DNA" behind. "Allele Sail offers a way to change the traits and fates of wild populations in ways that may be more acceptable, as the genetically modified part is introduced at low frequencies and usually won't last forever," he says. Genetic engineering could address major global challenges by altering the genetic makeup of certain wild populations—for example, to combat mosquito-borne illnesses such as malaria, or stop the spread of environmentally harmful invasive pests like cane toads. But there is genuine public concern about introducing genetic modification into wild populations, and many regulatory constraints. People are worried that modified organisms could contain foreign DNA that cause unpredictable ecological consequences over time; they worry that engineered genes could spread to other species with unknown impacts on ecosystems; and they also fear that once genetic modifications are introduced, they may not be able to be reversed. Traditional methods of genetic modification can also see a rapid spread of engineered genes within a population, raising both ecological and ethical questions. In response, many regulatory frameworks have been introduced to address genetic modification, presenting further challenges.
Researchers develop plant gene drive system for enhanced trait inheritance
30961Anonymous, Scientific Inquirer, 2024-07-25 20:23:52.
A collaborative research team led by QIAN Wenfeng from the Institute of Genetics and Developmental Biology (IGDB) of the Chinese Academy of Sciences and Peking University has developed a plant gene drive system called CRISPR-Assisted Inheritance utilizing NPG1 (CAIN), which, according to the researchers, uses a toxin-antidote mechanism in the male germline to override Mendelian inheritance in plants. Their findings were published in Nature Plants. In nature, gene inheritance typically follows Mendel’s laws, which provide an equal chance for alleles to pass on to the next generation—a cornerstone of Darwinian natural selection. However, super-Mendelian inheritance allows certain genes to be inherited at rates greater than the expected 50%, potentially allowing these genes to spread through populations even if they are detrimental to organisms. This mechanism opens the door to manipulating natural populations by introducing alleles that benefit humans even if they harm plant organisms themselves, or to eliminating species that are considered detrimental to human interests.
Mosquitoes On The Run Due To Wolbachia Programmes.
30949Anonymous, St Kitts and Nevis Observer, 2024-07-25 18:53:51.
Dengue is becoming an increasingly common disease in Central America and the Caribbean, according to PAHO, even as deaths from the mosquito-born condition have fallen in recent years due to improved identification of the condition and medical care. However the World Mosquito Progam is reporting considerable success in reducing mosquito born diseases like Dengue and reporting remarkable results from countries such as Colombia and El Salvador by using something called the Wolbachia method. What is this? Wolbachia are safe, naturally occurring bacteria present in up to 50% of species, including some mosquitoes. Wolbachia has evolved to live inside the cells of many insect species. It has maintained this lifestyle for tens of thousands of years. Wolbachia cannot survive outside of insect cells because it does not have the necessary machinery to replicate itself without help from the insect host. This means Wolbachia cannot survive in the environment (e.g. the air or soil). Wolbachia is not a virus or a parasite. It is not a “gene drive”. Wolbachia has never been genetically modified by scientists. However, Wolbachia is not usually found in the Aedes aegypti mosquito, the primary species responsible for transmitting viruses such as dengue, Zika, chikungunya and epidemic yellow fever.
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