Brady Collins
Vaccines have been one of the most effective ways to prevent and control infectious diseases. They have helped save millions of lives and prevent illnesses, disabilities, and deaths. While there is currently no vaccine to prevent HIV infection, researchers and scientists have been working tirelessly to develop one. HIV continues to be a significant threat to public health, with over 38.4 million people living with the virus worldwide in 2021. The development of a safe, effective, and affordable HIV vaccine could be a game-changer in controlling and ultimately ending the HIV/AIDS pandemic. Scientists are exploring innovative strategies and experimental vaccines to prevent and treat HIV, and clinical trials are underway to test the safety and efficacy of potential vaccines. While there have been setbacks and challenges, the search for an HIV vaccine remains a critical priority in global health.
| Characteristics | Values |
|---|---|
| Current availability of HIV vaccines | No HIV vaccines have been approved for use outside of clinical trials |
| Effectiveness of HIV vaccines | None have been proven effective |
| Safety of HIV vaccines | HIV vaccines being studied in clinical trials do not contain HIV and cannot transmit HIV |
| Benefits of HIV vaccines | Preventive HIV vaccines will teach the immune system to protect against HIV; therapeutic HIV vaccines will strengthen the natural immune response to HIV |
| Factors impacting vaccine recommendations for people with HIV | Age, previous vaccinations, likelihood of getting a particular disease, CD4 T lymphocyte (CD4 cell) count, and pregnancy status |
| Vaccines not recommended for people with HIV | Live attenuated vaccines (LAV) like the chickenpox, flu, and mpox vaccines |
| Importance of vaccines for people with HIV | Vaccines are important to prevent vaccine-preventable diseases like pneumococcal disease or the flu, which can be more severe for people with HIV |
| HIV vaccine development | Scientists are pursuing innovative strategies and experimental vaccines to prevent and treat HIV |
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What You'll Learn
HIV vaccine development
Despite almost four decades of research, there is currently no US Food and Drug Administration (FDA)-approved preventive HIV vaccine. However, researchers are pursuing innovative strategies to design an HIV vaccine to prevent or treat HIV infection.
The development of an HIV vaccine is challenging due to several factors. Firstly, HIV is highly mutable, meaning it can rapidly respond to selective pressures imposed by the immune system and evade its defences. Secondly, HIV isolates are highly variable, with multiple subtypes exhibiting a high degree of genetic divergence. Consequently, any vaccine developed must be able to account for this broad variability. Additionally, HIV vaccine development has been hindered by the fact that HIV-1 does not replicate in small animal models, and simian immunodeficiency virus (SIV) models are not suitable for direct testing of HIV vaccines.
Despite these challenges, scientists have made progress in HIV vaccine development. In 2016, results were published from the first Phase I human clinical trial of a killed whole-HIV-1 vaccine, SAV001. The trial, conducted in Canada in 2012, demonstrated a good safety profile and successfully elicited antibodies to HIV-1. Another vaccine, V520, was tested in two Phase 2b studies, Phambili and STEP. V520 was designed to stimulate HIV-specific cellular immunity, prompting the body to produce T cells that kill HIV-infected cells. However, the trial was stopped in 2007 due to concerns about an increased risk of HIV infection in some recipients.
The development of an effective HIV vaccine is crucial to eradicate the global HIV/AIDS crisis. While current treatments have helped curb the pandemic in developed nations, the majority of the world continues to suffer from this deadly virus. A vaccine would be a preventative solution, reducing the emergence of new strains and providing protection to millions. It would also alleviate issues associated with social stigma and improve accessibility to treatment.
In conclusion, while there is currently no approved HIV vaccine, researchers remain dedicated to its development. By leveraging new technologies and strategies, scientists are working tirelessly to create a vaccine that will prevent and treat HIV infection.
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Preventative HIV vaccines
Developing a preventive HIV vaccine has been a key part of the NIH's scientific mission since the HIV pandemic began. Researchers believe that a preventive HIV vaccine will be the most effective way to control or completely eliminate new HIV infections.
Despite almost four decades of research, there is currently no U.S. Food and Drug Administration (FDA)-approved preventive HIV vaccine available. However, scientists are pursuing innovative strategies to design an HIV vaccine to prevent or treat HIV infection. Several areas of interest are being studied in clinical trials, including the safety of preventive vaccines, whether a preventive vaccine protects against HIV infection, and the immune responses that occur in people who receive a preventive vaccine.
Developing a preventive HIV vaccine is a scientific challenge due to the unique properties of the virus. HIV typically mutates too quickly for antibodies and other immune responses to contain the infection in time. While most vaccines work by teaching the immune system to produce antibodies that clear an infection, antibodies are unable to clear HIV infection. A successful HIV vaccine will likely need to stimulate several branches of the immune system to respond to HIV. Researchers remain confident that a vaccine that protects against HIV infection is possible, but it could still be years or decades away.
In the meantime, people without HIV can take pre-exposure prophylaxis (PrEP), an HIV medicine used to prevent HIV. Additionally, people with HIV can benefit from vaccines against other diseases, as HIV weakens the body's immune response, making it harder to fight off vaccine-preventable diseases.
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Therapeutic HIV vaccines
Despite almost four decades of research, there are currently no U.S. Food and Drug Administration (FDA)-approved preventive or therapeutic HIV vaccines. However, scientists are working on innovative strategies to design an HIV vaccine to prevent or treat HIV infection.
A therapeutic HIV vaccine is designed to strengthen the natural immune response to HIV in people who already have the virus. Researchers are exploring the use of therapeutic HIV vaccines to slow the progression of HIV infection and achieve HIV remission, also known as a functional cure. This involves keeping the viral load suppressed without the need for regular antiretroviral therapy (ART). Therapeutic HIV vaccines may also reduce the likelihood of transmission to others.
Therapeutic vaccination aims to induce or enhance immunity to alter the course of a disease. Similar to therapeutic cancer vaccines, therapeutic HIV vaccines aim to boost the magnitude, breadth of antigen-specificities, and functionality of anti-HIV T cell responses. This facilitates long-term viral control in the absence of ART by eliminating infected cells.
One therapeutic HIV vaccine, Vacc-4x, has shown promising results in teaching the immune system to control HIV in some people with the virus and reducing their viral load. Therapeutic vaccination following early ART has also been shown to elicit highly functional T cell responses against conserved HIV-1 regions. 'Kick and kill' cure strategies within therapeutic vaccination aim to induce HIV protein expression in latently infected cells and trigger their elimination by cytolytic T cells.
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HIV vaccine trials
HVTN's mission is to fully characterize the safety, immunogenicity, and efficacy of HIV vaccine candidates to develop a safe and effective vaccine for global HIV prevention. Their work integrates vaccinology, social and behavioral sciences, statistics, and immunology. HVTN has conducted the majority of published, presented, or ongoing clinical trials of preventive HIV vaccines worldwide, with thousands of people participating in their trials.
In May 2025, two separate phase 1 clinical trials combining data from nearly 80 participants from North America and Africa showed promising results. These trials demonstrated that a targeted vaccine strategy could successfully activate early immune responses relevant to HIV and advance them further. One of the trials tested a stepwise vaccination strategy, using a technique called heterologous boosting, which involves administering a priming dose followed by a distinct booster dose to guide the immune system through antibody development stages. The second trial focused on the priming stage, showing that an initial vaccine dose could activate the desired immune cells in African participants.
While these trials provide proof of concept for a stepwise approach to vaccine development, there are currently no FDA-approved preventive HIV vaccines. However, researchers remain optimistic about the potential for a safe and effective HIV vaccine, and ongoing clinical trials continue to advance the fields of vaccinology and immunology in the pursuit of this goal.
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HIV vaccine safety
Developing a safe and effective vaccine is a global priority for ending the HIV pandemic. Vaccines are products made from very small parts of weak or dead germs (such as viruses, bacteria, or toxins) that can cause diseases. They help the immune system fight infections faster and more effectively. Vaccines have been the most effective means of preventing and even eradicating infectious diseases. They safely and cost-effectively prevent illness, disability, and death.
Although there are currently no vaccines to prevent or treat HIV, researchers have been studying HIV vaccines for nearly 40 years. Most of the HIV vaccine trials have been early-stage trials that investigate whether the vaccine is safe and whether an immune response to HIV is mounted following vaccination. Very few vaccine trials have advanced to late-stage testing, where scientists examine whether the vaccine effectively stops HIV infection. So far, no HIV vaccines have proven effective, and none have been approved for use outside of clinical trials. However, scientists are pursuing innovative strategies to design an HIV vaccine to prevent or treat HIV infection.
A preventive HIV vaccine, when available, will be given to people who do not have HIV to prevent HIV infection if they are exposed to the virus. Preventive HIV vaccines being studied in clinical trials do not contain HIV and cannot transmit HIV. Therapeutic HIV vaccines, on the other hand, are for people who already have HIV. The goal of a therapeutic HIV vaccine is to strengthen the natural immune response to the virus in people with HIV.
For people living with HIV, vaccines against other diseases, such as hepatitis B, influenza, and pneumococcal disease, are important. HIV can weaken the body's immune response to a vaccine, making it less effective. Therefore, it is recommended to consult a healthcare provider about which vaccines are suitable and necessary, considering factors such as age, health status, previous vaccinations, and other factors. Live attenuated vaccines (LAVs), for example, contain a weakened but live form of the disease-causing germ and may not be recommended for people with HIV as they can potentially cause an infection.
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Frequently asked questions
No, there are currently no vaccines to prevent HIV infection.
HIV is enormously genetically variable within and across populations and even within an individual. An effective vaccine will need to block a huge number of genetically variable forms of HIV.
Yes, there are ongoing clinical trials for HIV vaccines. In 2021, a study showed that it is possible to protect people from acquiring HIV by giving them infusions of bnAbs. However, this only worked when the bnAbs and the circulating viruses were very well matched, and the level of bnAbs in the blood was quite high.
The goal of a preventive HIV vaccine is to prevent people from getting HIV. When available, it will be given to people who do not have HIV.
A therapeutic HIV vaccine is for people who already have HIV. Its goal is to strengthen the natural immune response to the virus that is already in people with HIV.
