{"id":3846,"date":"2022-03-25T09:56:19","date_gmt":"2022-03-25T07:56:19","guid":{"rendered":"https:\/\/wits-vida.org\/?p=3846"},"modified":"2022-03-25T09:56:47","modified_gmt":"2022-03-25T07:56:47","slug":"novavax-covid-19-vaccine-trial-results-show-efficacy-against-the-b-1-351-variant-in-sa-study","status":"publish","type":"post","link":"https:\/\/wits-vida.org\/press-release\/novavax-covid-19-vaccine-trial-results-show-efficacy-against-the-b-1-351-variant-in-sa-study\/","title":{"rendered":"Novavax Covid-19 vaccine trial results show efficacy against the B.1.351 variant in SA study"},"content":{"rendered":"
\"Prof<\/span><\/div>

Results from the initial primary analysis of the Novavax Covid-19 vaccine trial conducted by Wits VIDA in SA have been published.<\/strong><\/p>\n<\/div>

The\u00a0New England Journal of Medicine<\/em>\u00a0(NEJM) today\u00a0published<\/a>\u00a0findings of the Phase 2b clinical trial conducted in South Africa.<\/strong><\/p>\n

NEJM is recognised as the world\u2019s leading medical journal.<\/p>\n

Shabir Madhi, Professor of Vaccinology, co-author of the study, and the Director of the Vaccines & Infectious Diseases Analytics Research Unit (Wits VIDA), led the Novavax Covid-19 vaccine trial in South Africa.<\/p>\n

The published data provide additional detail of an\u00a0initial analysis<\/a>\u00a0conducted in January, while more robust data from a complete analysis of the study was subsequently\u00a0shared<\/a>\u00a0in March 2021.<\/p>\n

Publication of initial primary analysis highlights cross-protection by the Novavax Covid-19 vaccine against the B.1.351 variant prevalent in South Africa during the study.<\/p>\n

This is the first published study to show protection against\u00a0mild<\/em>\u00a0Covid-19 caused by the B.1.351 variant circulating in South Africa.<\/p>\n

An updated analysis of the study indicated 100% protection against\u00a0severe\u00a0<\/em>Covid-19 due to the B.1.351 variant.<\/p>\n

\u201cAn efficacy of 50% is sufficient to meet the World Health Organization criteria for regulatory approval of the vaccine,\u201d says Madhi.<\/p>\n

The Novavax Covid-19 vaccine, known as NVX-CoV2373, is made by Novavax, Inc., a US-based biotechnology company developing next-generation vaccines for serious infectious diseases.<\/p>\n

Gregory M. Glenn, M.D., President of Research and Development, Novavax, says: \u201cThis data publication reinforces the encouraging safety profile and cross-protective effect across variants seen in studies of our vaccine to-date.\u201d<\/p>\n

About the study<\/strong><\/p>\n

The Phase 2b randomised, observer-blinded, placebo-controlled trial conducted in South Africa evaluated efficacy, safety and immunogenicity in healthy adults, and in a small cohort of medically stable adults living with human immunodeficiency virus (HIV).<\/p>\n

The study met its primary endpoint \u2013 i.e., the Novavax vaccine demonstrated an overall efficacy of 49% in the initial analysis (published in NEJM), and 49% in the subsequent complete analysis (unpublished).<\/p>\n

Among healthy adults without HIV, the Novavax vaccine demonstrated efficacy of 60% in the initial analysis, and 55% in the subsequent complete analysis.<\/p>\n

In the initial analysis, cases were predominantly mild-to-moderate and due to the B.1.351 variant that dominates in South Africa, and increasingly in southern Africa.<\/p>\n

In the subsequent complete analysis, circulation of the B.1.351 variant continued to dominate, and all five cases of severe disease observed in the trial occurred in the placebo group.<\/p>\n

The initial analysis, now being published in NEJM, suggested that prior infection with the original Covid-19 strain did not protect against subsequent infection by the variant predominantly circulating in South Africa through 60 days of follow-up.<\/p>\n

However, with additional follow-up, the complete analysis of the South Africa trial indicates that there may be a modest protective effect of prior exposure with the original Covid-19 strain.<\/p>\n

Among placebo recipients, at 90 days of follow-up, the illness rate was 8.0% in baseline seronegative participants and 5.9% in baseline seropositive participants.<\/p>\n

\u201cThe data make a compelling case for use of the Novavax Covid-19 vaccine in settings where the B.1.351 variant dominates \u2013 which is most of southern Africa \u2013 to reduce the risk of mild disease and also to maximise the opportunity for protection against severe Covid,\u201d says Madhi. \u201cFurther work is required for Novavax and all other Covid-19 vaccines, particularly in people living with HIV.\u201d<\/p>\n

The\u00a0Novavax Covid-19 vaccine trial<\/a>\u00a0is one of two Covid-19 vaccine trials in South Africa led by Madhi and Wits VIDA, with the other being the\u00a0Oxford\/AstraZeneca Covid-19 vaccine trial<\/a>.<\/p>\n

In addition to directing Wits VIDA, Madhi is Dean of the\u00a0Faculty of Health Sciences<\/a>\u00a0at the University of the Witwatersrand, Johannesburg (Wits<\/a>), and co-Director of African Leadership in Vaccinology Expertise (ALIVE<\/a>).<\/p>\n

About the Wits Vaccines & Infectious Diseases Analytics (VIDA) Research Unit<\/strong><\/p>\n

Formerly known as the Respiratory and Meningeal Pathogens Research Unit (RMPRU) and founded in 1995, the Vaccines and Infectious Diseases Analytics (VIDA) Research Unit of the University of the Witwatersrand (Wits) is an internationally recognised, African-led research unit in the field of epidemiology of vaccine preventable diseases, and clinical development of life-saving vaccines.<\/p>\n

Under the guidance of Professor Shabir Madhi, a global leader in the field of paediatric infectious diseases and the Dean of the Faculty of Health Sciences at Wits University, Wits VIDA is conducting translational research on vaccine preventable diseases and training the next generation of clinician scientists.<\/p>\n

Combining clinical, microbiological and epidemiological expertise in an African setting, Wits VIDA\u2019s cutting-edge scientific research informs local and global policy recommendations on the use of next-generation and novel vaccines today.<\/p>\n

In addition to various other studies on Covid-19, Wits VIDA championed and led the first two Covid-19 vaccine trials in Africa in 2020, for the Oxford and Novavax vaccine candidates.<\/p>\n

About the Novavax vaccine known as NVX-CoV2373<\/strong><\/p>\n

NVX-CoV2373 is a protein-based vaccine candidate engineered from the genetic sequence of the first strain of SARS-CoV-2, the virus that causes Covid-19 disease.<\/p>\n

NVX-CoV2373 was created using Novavax’ recombinant nanoparticle technology to generate antigen derived from the coronavirus spike (S) protein and is with Novavax’ patented saponin-based Matrix-M\u2122 adjuvant to enhance the immune response and stimulate high levels of neutralizing antibodies.<\/p>\n

NVX-CoV2373 contains purified protein antigen and can neither replicate, nor can it cause Covid-19. In pre-clinical studies, NVX-CoV2373 induced antibodies that blocked the binding of spike protein to cellular receptors and provided protection from infection and disease.<\/p>\n

It was generally well-tolerated and elicited robust antibody response in Phase 1\/2 clinical testing.<\/p>\n

NVX-CoV2373 is stored and stable at two degrees Celsius to eight degrees Celsius, allowing the use of existing vaccine supply chain channels for its distribution. It is packaged in a ready-to-use liquid formulation in 10-dose vials.<\/p>\n<\/div>