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Dengue Fever Transmission Has Been Cut by an Incredible 77% in a Real-World Trial

Scientists simply received a step nearer to eliminating the unfold of mosquito-borne viruses, with an experimental method in opposition to dengue fever passing its most thorough check but. 


In a randomized, double-blind trial, researchers launched mosquitoes contaminated with the virus-fighting Wolbachia micro organism into an Indonesian metropolis. Over the following 27 months, the members in the areas with the bacteria-carrying bugs skilled 77 p.c much less dengue than these in the management group.

“This result demonstrates what an exciting breakthrough Wolbachia can be – a safe, durable and efficacious new product class for dengue control is just what the global community needs,” says infectious researcher Cameron Simmons from Monash University. He’s additionally director of the Oceania Hub on the World Mosquito Program, which led the trial.

Dengue fever, brought about by the dengue virus, is unfold by feminine Aedes aegypti mosquitoes. It’s discovered globally in tropical and sub-tropical areas and in current a long time infections have surged, with an estimated 100 to 400 million infections annually. The World Health Organization now considers dengue essentially the most vital mosquito-borne virus in the world (malaria is brought about by a parasite, not a virus). 

Dengue fever usually presents with flu-like signs however in uncommon circumstances it could possibly additionally set off extreme dengue, which is related to bleeding, organ failure and threat of demise. Up to 25,000 folks die from the illness annually.


There’s presently no generally accepted remedy, and the vaccine is simply beneficial for individuals who have already been contaminated with the dengue virus, because the inoculation can set off extreme dengue in those that’ve by no means had the illness.

The good news is that in current years, an experimental method has proven promise in slowing down the illness’s unfold: the introduction of a bacterium referred to as Wolbachia into mosquito populations. 

Wolbachia is of course discovered in round 60 p.c of insect species, and when launched to A. aegypti, it is handed from era to era, which suggests finally all mosquitoes in a inhabitants will probably be contaminated with Wolbachia. 

Bacterial an infection could sound like a dangerous factor, however analysis has proven that when the mosquitoes carry the micro organism, it slows down the copy of viruses, making it much less possible they’re going to be transmitted to different folks. Excitingly, whereas dengue is the main focus of this work, Wolbachia has additionally been proven to work in opposition to yellow fever, Zika virus and chikungunya.

Scientists have been actively infecting A. aegypti mosquitoes with Wolbachia and releasing them for greater than a decade in varied check websites together with Brazil and Fiji, and intensive analysis has proven that the method poses negligible well being dangers for people and the atmosphere.


Already in Australia’s far north Queensland, dengue has been principally eradicated because of the World Mosquito Program’s Wolbachia trial.

However, it may be exhausting to arrange enough trial parameters when working with real-world populations, and the newest method is likely one of the first randomized trials. It’s additionally the primary to measure for virologically confirmed dengue, making it essentially the most thorough check thus far.

“I really think the results of this trial will be a game changer,” says World Mosquito Program Director of Impact Assessment, Katie Anders. 

“There have been a lot of people watching our work over the years – waiting to see the results of this trial. Now that they’re published people don’t need to take our word for it. The data is there that this really works to prevent dengue.”

Working with the area people in a 26 km2 (10 sq. mile) space of Yogyakarta metropolis in Indonesia, the researchers divided the area into 24 geographic clusters. 

Between March and December 2017, the group randomly deployed Wolbachia-contaminated mosquitoes in 12 of those clusters (referred to as the intervention clusters). The different 12 clusters obtained no deployments and had been used as controls. All clusters in the research continued to follow native mosquito-control measures all through the trial.


The researchers then recruited folks aged between 3 and 45 who introduced at major care clinics with any sort of undifferentiated fever over the following 27 months. They used lab exams to determine which of those had dengue and which did not. 

Over the trial, they examined a whole of 8,144 members. The lab outcomes confirmed that solely 67 folks (or 2.3 p.c) in the intervention clusters the place Wolbachia-carrying mosquitoes had been launched had clinically identified dengue fever, in comparison with 9.4 p.c of individuals (318 circumstances) in the management clusters.

Overall, the introduction of the bacteria-carrying mosquitoes decreased the unfold of dengue by 77.1 p.c. This consequence was related in opposition to all 4 dengue fever subtypes.  

The research additionally discovered that 86 p.c fewer individuals who lived in intervention clusters ended up in hospital as a results of fever: 13 hospitalizations in comparison with 102 in the management areas

“This is a great success for the people of Yogyakarta,” says group member Adi Utarini from the World Mosquito Program and the University of Gadjah Mada in Yogyakarta, Indonesia.

“For a long time, people have always gone into sporadic panic, especially every rainy season,” she provides. “Worse still, this disease mostly strikes children, making the death rate among children relatively high.”

In far north Queensland, Australia, it solely took 4 years for no dengue transmissions to be recorded following the discharge of Wolbachia mosquitoes in the Cairns area; nonetheless, it is value noting the illness was by no means endemic there.

Hopefully with these optimistic outcomes, it’s going to solely be a matter of time earlier than we see related outcomes in different areas of the world nonetheless battling this illness.

The analysis has been revealed in the New England Journal of Medicine.


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