Investigational vaccine candidate did not provide sufficient protection against HIV infection

No vaccine-related safety signals identified

J&J HIV vaccine program continues with global Phase 3 Mosaico HIV study evaluating a different composition of the vaccine regimen in different populations

NEW BRUNSWICK, NJ, USA I August 31, 2021 I Johnson & Johnson (NYSE: JNJ), together with a consortium of global partners, today announced results from the primary analysis of a Phase 2b HIV vaccine clinical trial known as the Imbokodo study (also known as HVTN 705/HPX2008). Data showed the investigational HIV vaccine regimen did not provide sufficient protection against HIV infection in a population of young women in sub-Saharan Africa at high risk of acquiring HIV. The investigational vaccine was found to have a favorable safety profile with no serious adverse events.

Based on these results, the Imbokodo study will not continue. Study participants will be notified of the results, unblinded and informed whether they were in the study group who received the vaccine or the group who received placebo. Further analysis of the Imbokodo study is ongoing, and the study has provided enough data to progress with key immunological correlates research.

In parallel to the Phase 2b Imbokodo HIV vaccine trial, Janssen is sponsoring the ongoing Phase 3 Mosaico study (HVTN 706/HPX3002) which is testing the safety and efficacy of a different composition of the HIV vaccine regimen among men who have sex with men (MSM) and transgender individuals. This study is being conducted in the Americas and Europe where different strains of HIV are circulating. Given these differentiating factors and following consultations with the Mosaico study independent Data and Safety Monitoring Board (DSMB), it was decided that the Mosaico study will continue at this time.

“We are extremely grateful to the women who volunteered for the Imbokodo study, and to our partners, including the people on the frontlines, all of whom are contributing every day to this enduring quest to make HIV history,” said Paul Stoffels, M.D., Vice Chairman of the Executive Committee and Chief Scientific Officer at Johnson & Johnson. “HIV is a unique and complex virus that has long posed unprecedented challenges for vaccine development because of its ability to attack, hijack and evade the human immune system. While we are disappointed that the vaccine candidate did not provide a sufficient level of protection against HIV infection in the Imbokodo trial, the study will give us important scientific findings in the ongoing pursuit for a vaccine to prevent HIV. We continue to stand in solidarity with people living with and vulnerable to HIV, and remain committed to furthering our research against this devastating virus.”

What the Imbokodo Data Tell Us
The Imbokodo vaccine regimen was administered to participants through four vaccination visits over one year. The primary analysis was conducted 24 months after participants received their first vaccinations. The study’s primary endpoint was based on the difference in number of new HIV infections between the placebo and vaccine groups from month seven (one month after the third vaccination timepoint) through month 24. These data found that through 24 months of follow up, 63 of 1,109 participants who received placebo compared to 51 of 1,079 participants who received active vaccine acquired HIV. This analysis demonstrated a vaccine efficacy point estimate of 25.2% (95% confidence interval of -10.5% to 49.3%). The vaccine regimen did not cause harm and was generally well-tolerated.

“The high incidence of HIV among young women in sub-Saharan Africa reminds us that, despite great progress made in treatment and prevention, HIV remains a major health challenge for the region,” said Professor Glenda Gray, President and Chief Executive Officer, South African Medical Research Council (SAMRC) and Imbokodo’s Protocol Chair. “This underscores the need to apply the knowledge that will be gained from this trial to continue to advance the pursuit of a global HIV vaccine.”

The Imbokodo study tested an investigational HIV regimen with an adenovirus vector containing four mosaic immunogens (Ad26.Mos4.HIV) at four vaccination visits over one year. The Imbokodo regimen contains a soluble protein component (Clade C gp140, adjuvanted with aluminum phosphate) which is administered at vaccination visits three and four. The ongoing Phase 3 Mosaico study is testing a different investigational vaccine regimen that involves the administration of a mosaic-based mixture of soluble proteins (Clade C/Mosaic gp140) at vaccination visits three and four.

About the Phase 2b Imbokodo Study
Imbokodo, a Phase 2b proof-of-concept efficacy study of Janssen’s investigational HIV vaccine regimen, began in 2017, reached full enrollment in 2019 and completed vaccinations on June 30, 2020. The study enrolled approximately 2,600 young women across five countries in sub-Saharan Africa, a region where women and girls accounted for 63 percent of all new HIV infections in 2020.1 The study took place at 23 trial sites in Malawi, Mozambique, South Africa, Zambia and Zimbabwe. Study investigators ensured that any HIV-infected participants in Imbokodo were referred to high-quality HIV treatment and care services. 

Imbokodo was supported by a public-private partnership led by Janssen Vaccines & Prevention B.V., part of the Janssen Pharmaceutical Companies of Johnson & Johnson; the National Institute of Allergy and Infectious Diseases, part of the National Institutes of Health; the Bill & Melinda Gates Foundation; and the HIV Vaccine Trials Network (HVTN). Additional partners providing support included the U.S. Army Medical Research and Development Command (USAMRDC) and the Ragon Institute of MGH, MIT and Harvard. The study was conducted at clinical sites coordinated by HVTN, and the South African Medical Research Council (SAMRC) helped to implement Imbokodo in South Africa.

Since 2005, Janssen Vaccines & Prevention B.V. has been participating as a sub-grantee in the NIH-supported Integrated Preclinical/Clinical AIDS Vaccine Development (IPCAVD) program under grants AI066305, AI078526, AI096040 and AI128751 (Principal Investigator, Prof. Dan Barouch).

Johnson & Johnson’s Commitment to HIV
Johnson & Johnson has been committed to the fight against HIV for 25 years, playing a central role in bringing nine therapeutics to people living with HIV, and continues to drive innovation in HIV prevention and care.

In December 2020, the European Commission authorized the first complete, long-acting injectable treatment for HIV, which combines Janssen’s rilpivirine with ViiV Healthcare’s cabotegravir, offering people with HIV living in Europe the potential of replacing daily oral treatments with six injections per year (every-other-month). In January 2021, the U.S. Food and Drug Administration approved the treatment for an every-month dosing schedule (12 injections per year), and is considering a supplement New Drug Application (sNDA) that would extend this approval to include the every-other-month dosing schedule (6 injections per year). Also in January, the dapivirine ring, a discreet long-acting HIV prevention method specifically for women developed by the International Partnership for Microbicides (IPM) and based on Janssen’s compound, was recommended by the World Health Organization as an additional prevention choice for women with a substantial chance of contracting HIV as part of combination prevention approaches.

Johnson & Johnson also supports communities affected by HIV through initiatives such as the DREAMS Partnership in sub-Saharan Africa, the MenStar Coalition and the New Horizons program. To learn more, visit

About Johnson & Johnson
At Johnson & Johnson, we believe good health is the foundation of vibrant lives, thriving communities and forward progress. That’s why for more than 130 years, we have aimed to keep people well at every age and every stage of life. Today, as the world’s largest and most broadly-based healthcare company, we are committed to using our reach and size for good. We strive to improve access and affordability, create healthier communities, and put a healthy mind, body and environment within reach of everyone, everywhere. We are blending our heart, science and ingenuity to profoundly change the trajectory of health for humanity. Learn more at Follow us at @jnjglobalhealth.

About the Janssen Pharmaceutical Companies of Johnson & Johnson
At Janssen, we’re creating a future where disease is a thing of the past. We’re the Pharmaceutical Companies of Johnson & Johnson, working tirelessly to make that future a reality for patients everywhere by fighting sickness with science, improving access with ingenuity, and healing hopelessness with heart. We focus on areas of medicine where we can make the biggest difference: Cardiovascular & Metabolism, Immunology, Infectious Diseases & Vaccines, Neuroscience, Oncology, and Pulmonary Hypertension. Learn more at Follow us at

*Dr. Glenda Gray, President and Chief Executive Officer, South African Medical Research Council (SAMRC), is Protocol Chair of the Imbokodo study. Janssen Vaccines & Prevention B.V. partnered with the South African Medical Research Council (SAMRC) to help implement Imbokodo in South Africa.

1UNAIDS. GLOBAL HIV STATISTICS – Fact Sheet 2021. June 2021. Last accessed July 2021.

SOURCE: Johnson & Johnson