Breakthroughs Blog: Vaccines

Researchers at the University of Cape Town discovered a compound that blocks the cycle of malaria within the human body, regardless of its drug-resistant status. The compound acts a preventative tool as well as a treatment for those infected with malaria, as it can block transmission and prevent infection. The compound, MMV390048, began phase I clinical trials in 2014, but subsequent data has not yet been published. The drug will enter phase II clinical trials this year in Ethiopia, and it is hoped this drug will be on the market within the next ten. With the world circling in on polio eradication, global public health professionals have run into a major obstacle that makes ridding the disease incredibly complicated: A vaccine shortage. There currently isn’t enough injectable polio vaccine for the world to use, as demand is so high. There isn’t enough of the vaccine in production for each child to receive two shots, which is what researchers suggest to protect against contracting polio. An alternative is the oral polio vaccine, but due to its heightened risk of complications, professionals believe this vaccine will soon be phased out. While polio vaccine manufacturing may be ramped up to treat children in the next few years, it is essential that health care professionals continue to vaccinate children ten years post-eradication to ensure there is no resurgence of the disease. Funders, including the Gates Foundation, are now putting efforts toward the next surge in vaccine demand, and hope to overcome this obstacle to reach global eradication of polio once and for all. An outbreak of Ebola has been confirmed in the Democratic Republic of the Congo (DRC), and health researchers around the globe are working to distribute an experimental vaccine. While the outbreak is contained due to the geographic isolation of the cases, the WHO and Gavi are still working quickly toward an effective and globally approved vaccine that can be used in future outbreaks. The DRC has not requested a vaccine at this point in time, but these organizations are prepping for when the country requests it, or for if the outbreak spreads past the DRC. The vaccine is experimental, and requires special modes of transportation, yet proved incredibly successful during the Ebola outbreak of 2014.

In this regular feature on Breakthroughs, we highlight some of the most interesting reads in global health research from the past week. For many years, ineffective treatment plans and archaic diagnostic tools have stood as a barrier to tackling tuberculosis (TB). More recently, new drugs and diagnostics have emerged. Yet, availability has not always translated to widespread access. For example, despite the availability of new rapid diagnostic tools like GeneXpert, it is estimated that over 40 percent of new TB cases go undiagnosed or are not reported and use of older, less accurate sputum tests still outpace use of the GeneXpert. Though new drugs like bedaquiline and delamanid are not available, more than 75 of patients who need them do not have adequate access. A number of hurdles to adoption and scale-up exist from lack of funding for TB programs to high costs to implementation failures Action is needed by global leaders and innovators to break down these barriers if the global community wants to achieve its goal of eradicating TB by 2030. Malaria is more complex than scientists previously thought. In a recent study published in the Proceedings of the National Academy of Sciences, scientists used DNA fingerprinting to track malaria on a cellular level. They found that the parasite has a heightened level of genetic recombination developed during meiosis, leading to a wide variety of malaria strains. This suggests that malaria can evade immune system response, acting as a chronic disease—and it means there is no one-cure-fits-all solution. Because of the incredible amount of genetic diversity malaria can have in the body, one vaccine solution may not work for all individuals, casting doubt on the efficay of vaccines now in development. While this discovery makes malaria harder to prevent and eradicate, scientists have also discovered that malaria isn’t as transmissible as it first seemed, with the parasite only causing five or six secondary cases from one original infection, whereas it was previously thought one case could subsequently infect dozens of individuals. The International Partnership for Microbicides (IPM) has announced a clinical trial that is hopeful to significantly reduce cases of HIV in Sub-Saharan Africa and around the world. The clinical trial will use the IPM-developed dapivirine ring, a small silicone ring inserted in the vagina, releasing a contraceptive (levonorgestrel) and an anti-HIV drug (dapivirine). The ring is easy to insert and lasts three months. Building on the previous ring that only released dapivirine, having the ring also act as a contraceptive will not only reduce the likelihood of HIV infecting women, but will also provide women with the choice to protect against unwanted pregnancy. This trial is especially important because women are most at-risk for contracting HIV, especially in countries with low rates of condom use. IPM hopes to have the ring ready for shipment globally by 2020.    

In this regular feature on Breakthroughs, we highlight some of the most interesting reads in global health research from the past week. Researchers in Brazil have discovered the structure of the protein responsible for replicating the Zika virus thousands of times in cells, causing the virus to break through the cell wall and infect the body. Through many months of collecting data and studying the origins of the virus, the researchers put together a three-dimensional model of the protein and published their findings in Nature Communications. Zika is a flavivirus and in the same genus as diseases like yellow fever, dengue, and hepatitis C. Because of the genetic similarity, researchers and scientists have found that sofosbovir, a commonly used drug to treat hepatitis C, is a good therapeutic option for those suffering from Zika. The unlocking of Zika’s genetic code will lead to the development of new solutions to the virus. It recently became global news that RTS,S (trade name Mosquirix™), the candidate malaria vaccine furthest along in development, is beginning vaccine pilot programs in three chosen countries: Ghana, Kenya, and Malawi. The vaccine, created through a partnership with PATH’s Malaria Vaccine Initiative and GlaxoSmithKline, is given in four doses over a specific period of time. It is not yet known if tracking of these vaccine doses will be 100 percent. Any vaccine administered in multiple doses, whether for malaria or HPV, requires a lot more work in educating individuals about the need to return for all treatments necessary to ensure the vaccine’s success. UNICEF and members of the vaccine community will work with government authorities to ensure the supply chain delivers vaccines to children in need. If successful, the burden of malaria could decrease drastically. While this vaccine is promising to many individuals in these three countries, the search for a more perfect vaccine is high on the priority list for health researchers around the globe. In order to increase global access to immunization, successful and smooth-moving supply chains are necessary. The problem? Immunization supply chains are complex and every part of the chain needs to be working perfectly to ensure access to the vaccines. Many members of the immunization community have neglected the supply chain facet of vaccine delivery, and as a result, these supply chains have suffered and grown obsolete. With these chains being out-of-date, many children remain unvaccinated from even the most common diseases. A special issue published in Vaccine highlights these issues and brings the need for supply chain renewal to the forefront of the conversation. But even after this publication, more has to be done to ensure all members of the vaccine community work together to guarantee access to vaccines is in reach for all. Despite vaccine initiatives being stronger than ever, there is still a glaring gap in the number of children receiving basic vaccines. Currently, there are over 19 million children who are unvaccinated, leaving them susceptible to diseases that can be protected against. The American Academy of Pediatrics and the Centers for Disease Control worked together to establish the Global Vaccine Action Plan (GVAP) aimed at closing the gap of vaccine inequality around the globe. GVAP has already seen many successes, including fostering a working relationship with government institutions to implement surveillance techniques to figure out what vaccines children need most in each country. Kenya and Nepal, for example, have initiatives through pediatricians to educate families about the importance of vaccines for children’s development and longevity of life. GVAP is in the forefront of bridging the gap of health inequity and bringing immunization to all.

Science expands our understanding, makes the impossible possible, and helps us build the future we want for all people. Science drives the work of our Global Health Technologies Coalition, so we wanted to take a step back to reflect on five ways science is transforming global health:1. Science is generating treatments, cures, and vaccines to tackle the world’s most devastating diseases.  From a vaccine that has put us at the brink of eradicating polio to antiretroviral treatments that have dramatically extended the lives of people living with HIV and AIDS, science has generated new health technologies that have driven tremendous progress in global health. Thanks to investments in science and research, 82 new vaccines, drugs, diagnostics, and other lifesaving global health tools have been developed and introduced since 2000. These tools include a new meningitis A vaccine—which has already saved 378,000 lives and prevented 673,000 new infections since 2010—and new child-friendly malaria drugs that have helped cut childhood malaria deaths by 65 percent since 2000. Science has also fueled a robust pipeline of over 670 global health technologies now in development poised to further build upon these gains.2. Science is helping us understand the unique needs of users and communities so we can design the right tools for impact. A scientist assembles a point-of-care diagnostic test. Photo: PATH/Dan ChangDriving progress in global health is not just about developing tools that work; it’s about developing tools that work for the communities and contexts in which they are used. A diagnostic test won’t help us identify and control an emerging epidemic unless it can be administered on the spot in remote communities and deliver results quickly. Likewise, a woman is not likely to adopt a new contraceptive or HIV and AIDS prevention method unless it’s easy-to-use, comfortable, affordable, and fits in with her lifestyle and culture. Through surveys, data analysis, diagnostics, and user testing, science is enabling us to study end users and the environments and social systems in which they operate. This helps us better understand the complexity of their unique needs and design and refine technologies to deliver the most effective solutions for impact.3. Science is helping us predict, detect, and track emerging health risks so we can be better prepared to confront tomorrow's challenges. From using weather patterns to forecast the risk of insect-borne disease outbreaks, to employing genomics and evolutionary theory to predict how bacteria will become resistant to antibiotics, to advancing new hybrid systems that combine crowdsourced data with traditional disease surveillance, science is helping us better predict, detect, and track infectious disease outbreaks and other emerging health challenges. Early detection can make the difference between an outbreak becoming an epidemic and is critical to mounting an effective response.4. Science is helping us understand what works and what doesn't so we can better target interventions and design health programs for maximum impact.  How often does an insecticide-treated bed net need to be replaced, and how many tears can it sustain before its stops working? In an era of limited resources, can we predict which technologies and interventions are likely to save the most lives in a country if brought to scale? How do we get people to change their handwashing habits to reduce diarrheal disease and childhood deaths? These are the questions big and small that scientists, data analysts, and other health researchers are working to answer in labs, offices, and program sites across the United States and world. The answers they get are helping us better target health solutions and refine health programming to more save lives and more dollars.5. Science is putting information and data at our fingertips to help us fight global diseases and health challenges in new and unusual ways. The revolution in mobile technology, digital health, and big data is transforming our approach to fighting global diseases and health challenges. Health care workers are using mobile devices to track immunization coverage door-to-door and monitor vaccine supplies to prevent stockouts, doctors are using SMS to remind patients to take their tuberculosis drugs and treatment adherence, and health ministries are deploying new data visualization toolsto turn a mountain of data into accessible and actionable information to guide decision on to best deploy and target resources.Science creates a foundation upon which improvements in global health are built. It unlocks discoveries and fuels innovation, informs policies and programs, breaks down barriers, and ultimately advances better, healthier lives for all people. At this moment in time, it is more vital than ever that we build a convincing case of the benefits that flow from science and the importance of strong investment in science and research.In global health, science matters because #scienceserves and science saves.