December 8, 2023

Medical Trend

Medical News and Medical Resources

Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations

Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations, with 90% effective


Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations.  Novavax COVID-19 vaccine reports Phase 3 clinical results: high protection, low side effects, and prevention of mutant strains; results exceed expectations.


On June 14, 2021, the high-profile protein vaccine manufacturer, Novavax of the United States, released a news report, reporting the results of phase III clinical trials in 29,960 people tested in the United States and Mexico.

In Novavax’s clinical trial named PREVENT-19, NVX-CoV2373 has 90.4% protection against symptomatic COVID-19 (95% CI: 82.9-94.6), and 100% protection against moderate and severe COVID-19 .

In this 2:1 randomized, double-blind, placebo-controlled clinical trial, 77 cases were observed, including 63 in the placebo group and 14 in the vaccine group. Among them, 14 moderately severe cases were in the placebo group.

In Novavax’s genetic testing of 54 of 77 infected people, half of them were found to be Alpha strains.

In the subgroup analysis, the comprehensive protection of the NVX-CoV2373 vaccine against the current mutant strains (VOC and VOI) was 93%, the protection against non-VOC/VOI mutants was 100%, and the protection against the high-risk population was 91%.



Among PREVENT-19, the NVX-CoV2373 vaccine showed very good safety and tolerability. Pain and tenderness at the injection site are the most common, lasting less than 3 days; in addition, fatigue, headline and muscle pain are common systemic symptoms, lasting less than two days. There was no statistically significant difference in direct serious adverse reactions between the vaccine group and the placebo group.


Unique advantages of NVX-CoV2373 vaccine

NVX-CoV2373 can be placed at room temperature for a long time, and it is easier to operate and use. Therefore, it has unique advantages in countries and regions with poor transportation and storage conditions.

In addition, the NVX-CoV2373 vaccine is a recombinant protein vaccine, which makes it the choice of many people who are hesitant to mRNA vaccines.

Novavax has reached an agreement with Gavi, a vaccine alliance, to provide 1.1 billion doses of vaccine to low- and middle-income countries. In addition, Novavax also cooperates with the Serum Institute of India and SK Bioscience of South Korea to produce vaccines.

The company plans to produce 100 million doses per month by the end of the third quarter of 2021 and 150 million doses per month by the end of the fourth quarter.

Although Novavax’s vaccine technology is very good, the entire development process is full of low-level errors.

Including the failure to initiate clinical trials in the United States in the first time, and the completion of clinical trials in the United Kingdom and South Africa before starting clinical trials in the United States; later, it was postponed due to production problems.

The same is true for submitting an FDA application for approval. Novavax plans to submit an emergency use authorization (EUA) application to the FDA, but it may take until the end of September to submit an EUA application; this is very different from the immediate submission of applications by companies such as Pfizer and Moderna.

And because the current US vaccination rate has exceeded 52% of the entire population, the US Food and Drug Administration (FDA) may not authorize the EUA, which means that it will take more months to obtain approval.

For the burning eyebrows of COVID-19 epidemic, the delayed application means that more patients cannot use the vaccine; it also means that a lot of markets have been lost, which can be described as a double defeat.

This is also a situation that small biopharmaceutical companies must face squarely. Moderna’s mRNA vaccine research and development is similar, leading the way in research and development, but it was first approved by Pfizer. In the later publicity and marketing process, Moderna was even more stolen by Pfizer.

Nevertheless, I believe that Novavax will keep getting better. Because its recombinant protein vaccine technology is too strong.


NVX‑CoV2373 is a recombinant protein vaccine.

Novavax uses its own original nano recombinant protein technology to prepare vaccines to induce specific antibodies; at the same time, Novavax also has a patented special adjuvant to stimulate the human body to induce particularly high specific antibodies. Under these two technologies, the neutralizing antibody induced by NVX‑CoV2373 is 3.97 times the antibody level of the recovered patient! The levels of neutralizing antibodies induced by mRNA vaccines from Moderna (4.13 times) and Pfizer/BioNTech (3.84 times) are comparable.

With such a high level of neutralizing antibodies, NVX-CoV2373’s protection against the new coronavirus is equivalent to that of Pfizer and Moderna’s mRNA. In a clinical trial with 15,000 subjects in the UK, the overall protection of NVX‑CoV2373 was 89.7%; the protection of wild-type SARS-CoV-2 was 96.4%; the protection of Alpha mutant strain was 86.3%.

Recently, Novavax reported the results of part of the clinical trial of the COVID-19 vaccine combined with influenza vaccine that many people are concerned about and inquired. This data has been uploaded to medRxiv and has been submitted to Lancet.

The study pointed out that the combined vaccination has 87.5% protection against COVID-19. The study was randomly enrolled in a 1:1 group, and 217 people were given the COVID-19 vaccine NVX-CoV2373. Some of them received the flu vaccine at the same time as the first dose of NVX-CoV2373; 214 people received a placebo.

The immune response of the vaccination group was more significant, and certain adverse events (AEs) occurred, mainly creatine creatine, myalgia, pain and fatigue at the injection site.

This study pointed out that during the high season of seasonal influenza, especially at a specific time when it is double epidemic with COVID-19, combined vaccination is a simple and effective method. This method can be routinely promoted in the future.




Novavax: Phase III clinical data of the world’s first recombinant protein COVID-19 vaccine revealed that the vaccine’s effectiveness reached 90%.


1. It is expected to submit a listing application in the United States in the third quarter, which is likely to be the fourth COVID-19 pneumonia vaccine approved by the United States. Previously, the level of neutralizing antibodies of this vaccine was reported to be the highest, and the level of attention was high.

Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations


2. In the third phase of clinical trials, 30,000 subjects were enrolled in the United States and Mexico. The vaccine group and the placebo group were divided into 2:1 groups. The overall protective effect was 90.4%, and the protective effect was 100% for moderate and severe cases. There is also a 91% protection rate for high-risk groups.


A total of 77 infections were observed, 14 in the vaccine group and 63 in the placebo group. The vaccine group had mild cases, and the placebo group had 10 moderate and 4 severe cases.

Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations


3. Production capacity: The estimated production capacity is 100 million doses/month at the end of the third quarter of 2021; the production capacity is 150 million doses/month at the end of the fourth quarter. It seems that by 2022, vaccine production capacity will no longer be a bottleneck, and the logistics and vaccination capabilities of developing countries are very important.


4. Protective ability of mutant strains: Among 77 cases, 54 have been sequenced.

Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations


5. Better security

Novavax COVID-19 vaccine Phase 3 clinical results exceed expectations



(source:internet, reference only)

Disclaimer of

Important Note: The information provided is for informational purposes only and should not be considered as medical advice.