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Novavax Announces Extended Durability of Protection Against Infection and Disease in United Kingdom COVID-19 Vaccine Phase 3 Clinical Trial

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Novavax, Inc. (Nasdaq: NVAX), a biotechnology company dedicated to developing and commercializing next-generation vaccines for serious infectious diseases, today shared extended analysis from its pivotal Phase 3 clinical trial conducted in the United Kingdom (UK), showing that a high level of efficacy for its protein-based COVID-19 vaccine, NVX-CoV2373, was maintained over a 6-month period of surveillance.

Additionally, the analysis showed vaccine efficacy of 82.5% (95% CI: 75.0, 87.7) in protection against all COVID-19 infection – both symptomatic and asymptomatic – as measured by PCR+ or anti-N seroconversion.

“These data have two implications for NVX-CoV2373. Importantly, the vaccine offers protection against symptomatic and asymptomatic COVID-19 infection which may both interrupt virus transmission and prevent COVID-19 disease,” said Gregory M. Glenn, M.D., President of Research and Development, Novavax. “Additionally, we are encouraged to see that our COVID-19 vaccine maintains a high level of durable efficacy and continues to exhibit a reassuring safety profile in this extended timeframe.”

The data build upon the final analysis of the UK Phase 3 trial, published in the New England Journal of Medicine in June 2021, which was used as part of Novavax’ regulatory submissions for NVX-CoV2373 around the world and demonstrated a vaccine efficacy of 89.7% (95% CI: 80.2, 94.6), with cases collected over three months (median of 55 days of surveillance).

In the expanded data collection window, vaccine efficacy was evaluated over a 6-month period from November 10, 2020, through May 10, 2021 (median of 101 days of surveillance). NVX-CoV2373 continued to show a reassuring safety profile during this window, with adverse events that were balanced between vaccine and placebo groups. Additionally, the trial demonstrated continued protection with an overall vaccine efficacy of 82.7% (95% CI: 73.3, 88.8). Vaccine efficacy against severe disease was 100% (95% CI: 17.9, 100) during the 6-month efficacy collection window, in line with the initial analysis.

About NVX-CoV2373
NVX-CoV2373 is a protein-based vaccine engineered from the genetic sequence of the first strain of SARS-CoV-2, the virus that causes COVID-19 disease. NVX-CoV2373 was created using Novavax’ recombinant nanoparticle technology to generate antigen derived from the coronavirus spike (S) protein and is formulated with Novavax’ patented saponin-based Matrix-M™ adjuvant to enhance the immune response and stimulate high levels of neutralizing antibodies. NVX-CoV2373 contains purified protein antigen and can neither replicate, nor can it cause COVID-19.

Novavax’ COVID-19 vaccine is packaged as a ready-to-use liquid formulation in a vial containing ten doses. The vaccination regimen calls for two 0.5 ml doses (5 mcg antigen and 50 mcg Matrix-M adjuvant) given intramuscularly 21 days apart. The vaccine is stored at 2°- 8° Celsius, enabling the use of existing vaccine supply and cold chain channels. Use of the vaccine should be in accordance with official recommendations.

Novavax has established partnerships for the manufacture, commercialization and distribution of NVX-CoV2373 worldwide. Existing authorizations leverage Novavax’ manufacturing partnership with Serum Institute of India (SII), the world’s largest vaccine manufacturer by volume. They will later be supplemented with data from additional manufacturing sites throughout Novavax’ global supply chain.

About Matrix-M™ Adjuvant
Novavax’ patented saponin-based Matrix-M™ adjuvant has demonstrated a potent and well-tolerated effect by stimulating the entry of antigen-presenting cells into the injection site and enhancing antigen presentation in local lymph nodes, boosting immune response.

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