Novavax Completes Enrollment of PREVENT-19, COVID-19 Vaccine Pivotal Phase 3 Trial in the United States and Mexico

Novavax, Inc., a biotechnology company developing next-generation vaccines for serious infectious diseases, announced the complete enrollment of PREVENT-19, its pivotal Phase 3 study in the United States and Mexico to evaluate the efficacy, safety and immunogenicity of the company’s COVID-19 vaccine. Novavax has previously reported positive interim efficacy results of NVX-CoV2373, its recombinant protein-based vaccine candidate, in an ongoing Phase 3 clinical trial taking place in the United Kingdom.

“The full enrollment of PREVENT-19 is another important step in building a body of evidence to demonstrate that NVX-CoV2373 will be safe and effective across diverse, representative populations,” said Gregory M. Glenn, President of Research and Development, Novavax. “We thank the thousands of volunteers and individuals, including our partners at NIH, the COVID-19 Prevention Network and trial sites in the U.S. and Mexico, who enabled rapid recruitment and enrollment in the trial, which we believe is a critical aspect to building vaccine trust and uptake across the globe.”

PREVENT-19 was planned with specific recruitment diversity and representation goals and enrolled 30,000 volunteers. Location of trial sites emphasized communities and demographic groups most impacted by the disease, including those living with co-morbid conditions that place them at higher risk of complications from COVID-19. The trial largely reached its demographic goals amid the concurrent rollout of vaccines authorized for emergency use.


PREVENT-19 is a randomized, placebo-controlled, observer-blinded study to evaluate the efficacy, safety and immunogenicity of NVX-CoV2373 with Matrix-M in up to 30,000 subjects 18 years of age and older compared with placebo. Two thirds of the participants are assigned to randomly receive two intramuscular injections of the vaccine, administered 21 days apart, while one third of the trial participants receive placebo. Trial sites were also selected in locations where transmission rates were high to accelerate the accumulation of positive cases that could show efficacy.

PREVENT-19 is being conducted with support from the U.S. government partnership (formerly Operation Warp Speed), which includes the Department of Defense, the Biomedical Advanced Research and Development Authority (BARDA), part of the U.S. Department of Health and Human Services (HHS) Office of the Assistant Secretary for Preparedness and Response, and the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health (NIH) at HHS. BARDA is also providing up to $1.75 billion under a Department of Defense agreement.

About Novavax
Novavax, Inc.? is a biotechnology company that promotes improved health globally through the discovery, development and commercialization of innovative vaccines to prevent serious infectious diseases. The company’s proprietary recombinant technology platform combines the power and speed of genetic engineering to efficiently produce highly immunogenic nanoparticles designed to address urgent global health needs. Novavax?is conducting late-stage clinical trials for NVX-CoV2373, its vaccine candidate against SARS-CoV-2, the virus that causes COVID-19. NanoFlu™, its quadrivalent influenza nanoparticle vaccine, met all primary objectives in its pivotal Phase 3 clinical trial in older adults and will be advanced for regulatory submission. Both vaccine candidates incorporate Novavax’ proprietary saponin-based Matrix-M™ adjuvant to enhance the immune response and stimulate high levels of neutralizing antibodies.