Breakthroughs Blog: Tuberculosis

Interested in more global health innovation news? Every week GHTC scours media reports worldwide to deliver essential global health R&D news and content to your inbox. Sign up now to receive our weekly R&D News Roundup email. Recently published results from a Phase 3 clinical trial support Pfizer and Abbvie’s aztreonam-avibactam as a potential treatment for patients with serious gram-negative bacterial infections and limited treatment options. Aztreonam-avibactam is a combination of two antibiotic drugs that work together to effectively fight off tricky bacteria resistant to nearly all currently available antibiotics. The treatment was approved in April by the European Medicines Agency based on the results of two previous Phase 3 clinical trials that investigated the treatment's efficacy in treating several types of multidrug-resistant infections.Last week, TB Alliance announced the award of a $7.35 million four-year grant from the US Department of Defense’s Congressionally Directed Medical Research Programs for the research and development of host-directed approaches for treating tuberculosis (TB). Host-directed approaches, which target the immune response of the host (the infected person) rather than directly targeting the bacteria, could reduce the likelihood of the emergence of drug resistance and, in combination with new TB drugs, could offer shorter and less long and burdensome treatment regimens for those with drug-resistance and drug-sensitive TB. Specifically, the project will work toward preclinical proof-of-concept for at least one novel adjunct TB host-directed therapy and one therapeutic vaccine.At the HIV Research for Prevention Conference last week, the Population Council announced the results of a Phase 1 trial conducted in South Africa, which suggest that the three-month dapivirine vaginal ring for HIV prevention will be as effective as the one-month ring. The three-month dapivirine vaginal ring, a flexible silicon ring self-inserted into the vagina that slowly releases an antiretroviral drug to prevent HIV infection, was found to deliver the drug at higher levels than the one-month ring. If the longer-acting ring continues to demonstrate success in future trials, it could offer a more cost-effective and convenient option for women—it is expected to reduce the cost per user by 60 percent.  

Interested in more global health innovation news? Every week GHTC scours media reports worldwide to deliver essential global health R&D news and content to your inbox. Sign up now to receive our weekly R&D News Roundup email. On Thursday, the World Health Organization (WHO) asked manufacturers to submit mpox diagnostic tests for emergency review in an effort to speed up and broaden access to effective testing amid the mpox emergency on the African continent. WHO has also updated its mpox testing guidance and is working with countries to roll out testing, with 30,000 tests expected to arrive in African countries in the coming weeks. Manufacturers Labcorp and Roche have also said that they are working to increase their mpox testing capacity.The Coalition for Epidemic Preparedness Innovations (CEPI) will provide $2.05 million to South African biotech company Afrigen Biologics for a proof-of-concept project to investigate whether synthetic DNA could serve as an alternative to the traditional plasmid DNA used for mRNA vaccine development, cutting timelines and costs. The partnership supports the 100 Days Mission of reducing vaccine development timelines to just 100 days after identifying a disease outbreak with pandemic potential. The project could help further optimize mRNA vaccine development—which is already much faster and more flexible than traditional vaccines—in the face of an outbreak, as well as enable local manufacturing of vaccines in Africa, which could help facilitate more equitable access to vaccines.Last week, IAVI announced that the first participants at trial sites in Ghana, Liberia, and Nigeria had been vaccinated in a clinical trial of IAVI’s Lassa fever candidate. Lassa fever, for which there is limited treatment and no available vaccine, causes an estimated 300,000 cases across West Africa annually, and the threat is expected to grow due to climate change and population growth. The trial, funded by CEPI and designed in consultation with in-country partners, will evaluate the candidate’s safety, tolerability, and immunogenicity at two different dosage levels in adults, including people living with HIV, as well as in adolescents and children two years and older. The trial results are expected in 2025.

Interested in more global health innovation news? Every week GHTC scours media reports worldwide to deliver essential global health R&D news and content to your inbox. Sign up now to receive our weekly R&D News Roundup email. The US Food and Drug Administration (FDA) on Thursday approved updated COVID-19 vaccines from Pfizer and Moderna that target the KP.2 virus strain, which emerged from the highly contagious JN.1 variant that began circulating widely in the United States last winter. The new shots are expected to be available within days amid spiking case rates and hospitalizations for COVID-19. Experts also hope the vaccines will provide cross-protection against closely related subtypes of the virus, including KP.3.1.1 and KP.3, which are now spreading rapidly and account for 36 and 17 percent of all new cases, respectively. The FDA has not yet approved a third vaccine from drugmaker Novavax.The World Health Organization (WHO) this week recommended three new oral regimens for multidrug-resistant or rifampicin-resistant tuberculosis (TB) that can cure patients more quickly and successfully than the current painful injectable regimens. These regimens—which include the use of new and repurposed medicines like bedaquiline, pretomanid, linezolid, and delamanid—can be offered to nearly all patients and can improve treatment success by shortening treatment time to six to nine months, rather than the usual 18 months, while reducing treatment toxicity and the spread of drug-resistant forms of TB. WHO’s recommendations are based on results from the BEAT-TB clinical trial conducted in South Africa and the endTB trial conducted in seven countries between 2017 and 2023 by Médecins Sans Frontières, Partners In Health, and Interactive Research and Development and funded by Unitaid.  A new study found that giving azithromycin to all children up to five years old can greatly reduce childhood mortality in sub-Saharan Africa, more so than by limiting the distribution of the antibiotic to younger children, as recommended by WHO. The study, published Wednesday in the New England Journal of Medicine, found that twice-yearly distribution of azithromycin to children ages 1 to 59 months in rural communities in Niger reduced childhood mortality by 14 percent when compared with children who received a placebo. Further, the study found that targeting only children ages 1 to 11 months (recommended by WHO in 2020) did not lead to a significant reduction in childhood mortality. However, concerns remain about the effect of routinely distributing the antibiotic to all children under five on antimicrobial resistance. 

The last few years have highlighted more than ever the incredible power of vaccines—from the millions of lives saved by the unprecedented rapid development of COVID-19 vaccines to the approvals and early-stage rollout of the first-ever vaccines for malaria and chikungunya.  We are now fortunate to have vaccines to prevent more than 20 life-threatening diseases, and immunization currently prevents 3.5 to 5 million deaths every year. While it is vital that countries continue to strengthen routine immunization programs to reach the 20 million children who missed out on one or more of their vaccines in 2022, it is also important that countries sustain strong investments in research and development to deliver the next generation of breakthrough vaccines.In recognition of World Immunization Week 2024, GHTC is highlighting five vaccines in development that could be game changers for some of world’s most threatening diseases, reminding us not only of the tremendous impact vaccines have already had but also of the great promise of innovative vaccines to save even more lives in the future.1. TBIn 2022, 1.3 million people worldwide died from tuberculosis (TB), which is the second leading infectious disease killer after COVID-19. Currently, the only approved vaccine for TB is the bacille Calmette-Guérin, or BCG, vaccine, which was developed more than 100 years ago. Though effective at preventing some types of TB in infants, it offers inconsistent protection in adults and adolescents against pulmonary TB, which is why new vaccine options are urgently needed.Last month, the Bill & Melinda Gates Medical Research Institute announced the launch of a pivotal Phase 3 trial evaluating a novel vaccine for TB, which researchers hope could become the second licensed vaccine for TB. The adjuvanted subunit vaccine M72/AS01E vaccine was originally developed by GSK, along with Aeras and IAVI. The trial, which is supported by the Bill & Melinda Gates Foundation and the Wellcome Trust, is testing the vaccine’s ability to prevent latent TB from progressing to active pulmonary TB in adults and adolescents. While it is expected that the trial could take at least five years, if successful, it could lead to an urgently needed new tool with the potential to transform TB control globally.2. ZikaZika is a mosquito-borne virus that can cause congenital malformations in infants born to individuals infected during pregnancy, as well as preterm birth and miscarriage. There are currently no vaccines available to prevent or treat Zika, nor are there specific treatments.There have been numerous outbreaks of Zika around the world, with a widespread outbreak in the Americas just under a decade ago sparking the World Health Organization (WHO) to declare a Public Health Emergency of International Concern in 2016.Last month, Valneva announced the launch of a Phase 1 clinical trial to investigate the safety and immunogenicity of a vaccine against the Zika virus. The second-generation adjuvanted inactivated vaccine candidate, VLA1601, will be tested in 150 adult participants in the United States, with the first topline data from the trial expected as soon as early next year. Additionally, Moderna is advancing an mRNA-based Zika vaccine, mRNA-1893, which is currently in a Phase 2 trial in the United States and Puerto Rico; the trial is expected to end in July 2024.3. Lassa feverLassa fever is an acute viral hemorrhagic illness that is endemic primarily in parts of the West African region. Annually, there are around 5,000 deaths from Lassa fever and an estimated 100,000 to 300,000 cases. There are currently no approved vaccines that protect against Lassa fever.This month, the first participants were vaccinated in a Phase 2 clinical trial of a vaccine candidate for Lassa fever virus, which is being led by an international collaboration between IAVI, the Coalition for Epidemic Preparedness Innovations (CEPI), and in-country partners in Nigeria. The hope is that this trial, which is the most advanced Lassa vaccine trial to date, will lead to the availability of a vaccine candidate for evaluation and use in future Lassa outbreaks and, eventually, an approved vaccine for routine immunization.  4. Nipah virusNipah virus is a zoonotic virus that can cause a wide range of illnesses, from asymptomatic infection to severe respiratory illness and, sometimes, fatal brain inflammation. Nipah has an estimated case fatality rate of 40 to 75 percent, with South Asia facing the greatest burden of outbreaks. There are currently no specific drugs or vaccines for Nipah virus infection.The first human trial of a new vaccine against the deadly Nipah virus began in January of this year after the work, which started in 2017, was paused during the COVID-19 pandemic. The new vaccine, ChAdOx1 NipahB, which was developed using the same viral vector vaccine technology as the University of Oxford and AstraZeneca’s COVID-19 vaccine, will be evaluated over the next 18 months in a Phase 1 trial led by the Oxford Vaccine Group and funded by CEPI.5. ETECEnterotoxigenic Escherichia coli (ETEC) is one of the leading causes of moderate and severe diarrhea in children worldwide. It is estimated that ETEC causes about 220 million diarrhea episodes globally each year, resulting in an estimated 42,000 child deaths. There are currently no approved vaccines for ETEC, and bacterial resistance to the antibiotics often used to treat it is growing globally, underscoring the need for a preventative vaccine.ETVAC is an oral vaccine candidate for ETEC developed by Scandinavian BioPharma, which is being advanced in two different formulations, one for travel use, adults, and older children and a second “self-contained” solution requiring no mixing, which is designed for ease of administration in children under five in low- and middle-income countries. The vaccine has shown promising results in both populations in Phase 1 and 2 trials, which received partial funding from PATH through the Bill & Melinda Gates Foundation, and a Phase 2b trial was implemented among nearly 5,000 children in The Gambia, with efficacy results expected later this year, alongside the potential launch of a planned Phase 3 study in Zambia. If successfully advanced and approved, an ETEC vaccine could be a powerful new tool in our arsenal to reduce suffering and death from diarrheal disease and slow the emergence of antimicrobial resistance.  Breakthrough technologies like these vaccine candidates are possible because of long-term, consistent investment throughout the R&D process, from early-stage product development to implementation and rollout. With these promising technologies and more on the horizon, it is critical that we sustain investment in R&D to push these exciting new tools over the finish line and ensure everyone everywhere can access them. Learn more about global efforts for World Immunization Week to recognize the lifesaving power of vaccines here.