The World Mosquito Program has successfully prevented outbreaks of Dengue and Zika using a unique and effective method.
Mosquito. Gerald Yuvallos. CC BY-ND 2.0.
The World Mosquito Program (WMP) is an Australian-based nonprofit organization working to eradicate several diseases carried and spread by mosquitoes, specifically Dengue and Zika. About 50 million people per year contract Dengue, while there are roughly between 100,000 and 500,000 cases of Zika per year worldwide. Both Dengue and Zika are mosquito-born illnesses, but they have very different effects. Dengue has a wide range of symptoms, and in the worst cases, the disease can end in hospitalization and death. Dengue is primarily a problem in Asia, with 70% of global cases occurring in the continent, though cases have been reported in 129 countries total. There is a vaccine for Dengue, but regardless, Dengue is still a leading cause of death in certain places in Asia and South America.
Zika, on the other hand, rarely causes death, but it is known for causing birth defects if caught by pregnant women. In addition to issues for fetuses, if caught by teens or adults, Zika can cause Guillain-Barré syndrome, in which the body’s immune system attacks its nervous system, leading to nerve damage of differing severity. There is no vaccine for Zika, and thus, the World Mosquito Program’s work is necessary in this area.
The primary strategy for WMP is breeding mosquitoes that carry a specific bacteria—Wolbachia—which prevents the mosquitoes from spreading these diseases. Once WMP has bred the Wolbachia mosquitoes, they work with governments to determine a plan to disperse the mosquitoes. The goal is that eventually, the non-Wolbachia carrying mosquitoes will die out by natural evolutionary processes. This method has produced positive results multiple times. While it takes some time to see results, the Wolbachia method has been praised for the fact that it uses a naturally occurring bacteria. Thus, it has a minimal impact on the ecosystem. Though there are treatments for Zika and Dengue, there are very few prevention methods other than the Dengue vaccine, which makes the Wolbachia method unique in its field. While Dengue and Zika are both serious and dire diseases, the most well-known mosquito-borne disease is malaria. Zika and Dengue are spread by the same type of mosquito, while malaria is transmitted by a different type, which is why the Wolbachia method cannot be used for malaria prevention.
I had the opportunity to interview Christie Hubbard, the Director of Philanthropic Partnerships for WMP. She explained in a bit more detail how the Wolbachia method is carried out. Hubbard explained the function of the bacteria, and the surprising simplicity of the process, saying: “This bacteria, Wolbachia, renders the female unable to transmit disease… Because it naturally occurs we don’t have to modify it, and we literally breed mosquitoes.” These “Wolbachia mosquitoes” are then released (with governmental permission) into areas suffering from Dengue outbreaks, under the assumption that through natural reproduction eventually the disease carrying mosquitoes will die out.
In terms of the tangible impact that WMP has had, Hubbard gave a few examples: “We did a gold standard trial in Indonesia… it resulted in a 77% reduction in Dengue and an 80% reduction in hospitalizations, which is really big… We’ve also seen success in Australia, which is where we’re founded and there’s a lot of Dengue. That’s where the program really first started and where we really… we never say eradicate, but we eliminated Dengue.” The near elimination of Dengue in two countries is an extreme feat, and WMP’s website also lists some other countries in which their method has seen success, such as Mexico and Sri Lanka. In both of these countries, there have not been any Dengue outbreaks in the areas where the Wolbachia mosquitoes were released in the years following their release.
Wolbachia method is launched by Brazil Ministry of Health. Ministério da Saúde. CC BY-NC-SA 2.0.
An obvious complication to WMP’s approach is that they are an Australian-based organization going into other countries. Hubbard addressed this, saying, “Our intervention is really geared towards governments and countries, so that’s who we work with and not so much private individuals. So yeah, we just go in, we release the mosquitoes, but it’s not as simple as that. It takes a long time, you’ve got to get the eggs to the country—we’ve got an insectary in every country—and of course there’s a big piece with community engagement, because you don’t just walk into another country and say, ‘hi, we’re bringing in more mosquitoes’... and working very closely with the ministries of health, and government officials.” WMP works in conjunction with the governments and the health officials of the countries which they work in, trying to eliminate any disruption or possible harm to the local communities. WMP’s website also publicly lists the percentage of the population of each place it works in that supports their intervention.
Get Involved
In terms of getting involved with WMP, there are few volunteer opportunities outside of the places where they are currently working. However, their website does have a page listing the places where they have or are currently working. Another, more accessible way to get involved that doesn’t require money is by simply raising awareness for WMP, and for the issue of mosquito-borne illness in general. Following and promoting their instagram, or even just educating yourself further on the issue through reading articles and sharing them with the people you know is a way to get involved, as this issue is not a high profile one.
Calliana Leff
Calliana is currently an undergraduate student at Boston University majoring in English and minoring in psychology. She is passionate about sustainability and traveling in an ethical and respectful way. She hopes to continue her writing career and see more of the world after she graduates.