Progress in scale-up and optimization of antiretroviral therapy is key to ending AIDS as a public health threat by 2030 as agreed by the international community. However, despite the dramatic increase in antiretroviral therapy coverage in the last decades, mortality remains unacceptably high amongst adults and children living with HIV. Currently, more than 600,000 AIDS-related deaths still occur per year [1], the majority in low-and middle-income countries (LMICs). If current trends continue, 460,000 people will die of AIDS-related causes in 2025.
Children, who represent only five percent of people living with HIV, are disproportionately affected as they contribute significantly to this death toll. An estimated 110,000 children and adolescents still die from AIDS-related causes annually [1], accounting for fifteen percent of AIDS-related deaths.
Severe loss of immune competence, or AHD, in the absence of effective HIV treatment among adults and children living with HIV puts them at risk of opportunistic infections and remains a persistent challenge for both newly initiating and antiretroviral therapy-experienced patients re-entering care. Thirty percent of people living with HIV still present to care with severe immunosuppression [2].
In an era where rapid screening and diagnostics tools, HIV treatment and effective therapies for preventing and treating coinfections associated with advanced HIV are available, the current rates of AIDS-related deaths are unacceptable. Forty percent of these deaths could be averted by addressing the main drivers of death for those with AHD [3]. Among HIV-opportunistic infections, tuberculosis (TB), cryptococcal meningitis (CM), severe bacterial infections (SBI), and disseminated histoplasmosis (DH) contribute to a substantial proportion of AIDS-related deaths. For children living with HIV, the major causes of morbidity and mortality are pneumonia, TB, bloodstream infections, diarrheal disease, and severe acute malnutrition [4].
Prior Unitaid investments [5] have enabled the generation of evidence on the feasibility of implementation of the AHD care package in adults through hub-and-spoke delivery models in selected countries in sub-Saharan Africa, increasing uptake and significantly improving access to some of the most impactful tools in WHO-recommended AHD package of care (medicines and diagnostics) in Africa and elsewhere. Since 2019, Unitaid has sought to renew the global focus on AHD and accelerate access to lifesaving diagnostics and medicines, with the aim of reducing morbidity and mortality among people with AHD and improving cost efficiencies for health systems to foster sustainable national AHD programs. In alignment with the WHO guidance [6], Unitaid investments have focused on optimizing the package of care including emerging key products for AHD-related infections, across screening (CD4 Advanced Disease lateral flow assay and CD4 count point-of-care, TB urine-Lipoarabinomannan (LAM), CrAg (Cryptoccoccal Antigen) lateral flow assay), prophylaxis (optimized TB preventive treatment), and treatment (fluconazole, Liposomal Amphotericin B and 5-Flucytosine). This initiative, has increased global and national awareness of these products, facilitating their adoption into the AHD package in national guidelines in focus- project countries (Botswana, India, Lesotho, Malawi, Nigeria, South Africa, Tanzania, Uganda, and Zimbabwe) and elsewhere through the expanded partner network. Further implementation and scale-up in countries in need is supported by country governments and donors including Global Fund [7] and PEPFAR [8].
However, significant challenges and opportunities remain for the delivery of simplified, decentralized care for the most vulnerable populations. Diagnosis and treatment of opportunistic infections can be challenging, especially in the rural areas, as the relevant tools are still unavailable for those facing the highest burden of these diseases.
- For SBIs (Severe Bacterial Infections), approaches and tools for enhanced prophylaxis and treatment are not standardized [9], in addition to complex diagnosis pathways. For fungal infections, simplification and decentralization of care are required to enable expanded use of emerging tools. Other developments in the diagnosis, prevention, and treatment of infections, including CM, have the potential to significantly reduce the death toll if they were brought to scale. Examples of tools that could be entering the market soon include the semi-quantitative cryptococcal antigen (CrAg) test and the Histoplasmosis lateral flow assay (LFA), which could allow for rapid and accurate detection of deadly opportunistic infections at lower levels of care, to be used in conjunction with improved treatments and prevention approaches with existing medicines that have become more affordable and accessible.
- Implementation of an optimal care package for children living with AHD is challenged by gaps in health worker knowledge and practice of opportunistic infection screening, diagnosis, prevention, and treatment. In addition, several optimal care package tools exist but are under-used due to these capacity gaps, as well as the absence of guidelines, standard operating procedures, and comprehensive monitoring and evaluation systems. The recent WHO STOP AIDS toolkit [4] provides guidance for a comprehensive package of care for children, that could be very impactful to accomplish the goal of zero AIDS-related deaths by 2030. However, there is very limited access to optimal tools, and limited real-life data regarding optimal strategies for effective prevention, rapid diagnosis, and successful treatment of HIV-associated infections in this population.
Accelerated adoption and preparing for further scale-up of simplified packages of care to reduce morbidity and mortality from AHD in decentralized settings represents a near-term opportunity that would support efforts to progress toward HIV-related mortality global targets for children, adolescents, and adults in high-burden countries.
By using innovative service delivery models that include optimal tools suitable for the most vulnerable populations, Unitaid will contribute to the global goal of zero pediatric AIDS-related deaths by 2030, and the target to reduce the number of people dying from HIV-related causes to less than 240 000 by 2030, and, in general, ending AIDS as a public health threat by 2030.