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June 14, 2021 - Results from a Phase 3 clinical trial enrolling 29,960 adult volunteers in the United States and Mexico show that the investigational vaccine known as NVX-CoV2373 demonstrated 90.4% efficacy in preventing symptomatic COVID-19 disease. The candidate showed 100% protection against moderate and severe disease. In people at high risk of developing complications from COVID-19 (people 65 years or older and people under age 65 with certain comorbidities or with likely regular exposure to COVID-19), the vaccine showed 91.0% efficacy in preventing symptomatic COVID-19 disease.

Safety data indicate the investigational vaccine was generally well-tolerated. Mild-to-moderate injection site pain and tenderness were the most common local symptoms among participants, and fatigue, headache and muscle pain lasting less than two days were the most common systemic symptoms.

Novavax, Inc., of Gaithersburg, Maryland, developed the investigational vaccine and led the clinical trial known as PREVENT-19(link is external). The Biomedical Advanced Research and Development Authority (BARDA), a component of the 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, provided funding support for the trial as part of the federal COVID-19 response.

The PREVENT-19 trial began in late December 2020 and enrolled adult volunteers at 119 study sites, including those in the NIAID-supported COVID-19 Prevention Network (CoVPN)(link is external). Participants were randomly assigned to receive two shots, 21 days apart, of either the investigational vaccine or a saline placebo. Randomization occurred in a 2:1 ratio with two volunteers receiving NVX-CoV2373 for each one who received placebo. Because the trial was blinded, neither investigators nor participants knew who received the candidate vaccine.

PREVENT-19 was designed to evaluate whether NVX-CoV2373 can prevent symptomatic COVID-19 disease seven or more days after the second injection relative to placebo. The results shared today are based on 77 cases of symptomatic COVID-19 that investigators observed among trial participants from January 25 through April 30, 2021. Investigators recorded 63 cases among the approximately 10,000 participants who received placebo and 14 cases among the approximately 20,000 participants who received the investigational vaccine. Of the 63 COVID-19 cases in the placebo group, investigators classified 10 as moderate and four as severe. There were no cases of moderate or severe disease in the investigational vaccine group.

NVX-CoV2373 is a subunit vaccine made from a stabilized form of the coronavirus spike protein using the company’s recombinant protein nanoparticle technology. The purified protein antigens in the vaccine cannot replicate or cause COVID-19. The vaccine also contains a proprietary adjuvant, MatrixM™. Adjuvants are additives that enhance desired immune system responses to vaccine. NVX-CoV2373 is administered by injection in liquid form and can be stored, handled and distributed at above-freezing temperatures (35° to 46°F.) A single vaccine dose contains 5 micrograms (mcg) of protein and 50 mcg of adjuvant. The vaccine is administered as two intramuscular injections 21 days apart. The technology used for this vaccine was developed under a long-standing contract with the Department of Defense.

Results from a Phase 3 clinical trial enrolling 15,000 adults in the United Kingdom showed a two-dose regimen of NVX-CoV2373 was highly effective(link is external) in preventing symptomatic COVID-19 overall and also demonstrated high efficacy against the Alpha variant strain of SARS-CoV-2.

An independent Data and Safety Monitoring Board (DSMB) is overseeing PREVENT-19 to ensure the safe and ethical conduct of the study. All Phase 3 clinical trials of candidate vaccines supported through the federal COVID-19 response are overseen by a common DSMB convened by NIAID.

In May 2021, PREVENT-19 was expanded(link is external) to evaluate the safety, efficacy and immunogenicity of NVX-CoV2373 in adolescents aged 12-17. Adolescent enrollment recently completed with 2,248 participants. For more information about PREVENT-19, see preventcovid.org(link is external)view the trial protocol(link is external), or visit ClinicalTrials.gov and search identifier NCT04611802.

About the COVID-19 Prevention Network: The COVID-19 Prevention Network (CoVPN) was formed by the National Institute of Allergy and Infectious Diseases (NIAID) at the U.S. National Institutes of Health to respond to the global pandemic. Through the CoVPN, NIAID is leveraging the infectious disease expertise of its existing research networks and global partners to address the pressing need for vaccines and antibodies against SARS-CoV-2. CoVPN will work to develop and conduct studies to ensure rapid and thorough evaluation of vaccines and antibodies for the prevention of COVID-19. The CoVPN is headquartered at the Fred Hutchinson Cancer Research Center(link is external). For more information about the CoVPN, visit: coronaviruspreventionnetwork.org(link is external).

About HHS/ASPR/BARDA: HHS works to enhance and protect the health and well-being of all Americans, providing for effective health and human services and fostering advances in medicine, public health, and social services. The mission of ASPR(link is external) is to save lives and protect Americans from 21st century health security threats. Within ASPR(link is external)BARDA(link is external) invests in the innovation, advanced research and development, acquisition, and manufacturing of medical countermeasures – vaccines, drugs, therapeutics, diagnostic tools, and non-pharmaceutical products needed to combat health security threats. To date, BARDA-supported products have achieved 60 FDA approvals, licensures or clearances(link is external). To learn more about BARDA's COVID-19 Portfolio(link is external) and BARDA’s COVID-19 Response(link is external), visit www.medicalcountermeasures.gov/(link is external).

About the National Institute of Allergy and Infectious Diseases: NIAID conducts and supports research — at NIH, throughout the United States, and worldwide — to study the causes of infectious and immune-mediated diseases, and to develop better means of preventing, diagnosing and treating these illnesses. News releases, fact sheets and other NIAID-related materials are available on the NIAID website.

About the National Institutes of Health (NIH): NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.

NIH…Turning Discovery Into Health®

Source: NIH