Novavax Vaccine 96% Effective Against Original Coronavirus, Late-Stage Trial Confirms

Results from the final analysis of the UK trial were largely in line with interim data released in January.

Novavax Inc’s COVID-19 vaccine was 96% effective in preventing cases caused by the original version of the coronavirus. This has been confirmed by a late-stage trial conducted in the United Kingdom, said the company on Thursday. With this, Norvax’s vaccine against Covid has moved a step closer to regulatory approval.

During the trial, the vaccine was found to be safe. No cases of severe illness or deaths among those who got the vaccine were found. “It is a sign that it could stop the worse effects of new variants that have cropped up”, said the company.

Results from the final analysis of the UK trial were largely in line with interim data released in January.

The vaccine was 86% effective in protecting against the more contagious virus variant first discovered and now prevalent in the United Kingdom, for a combined 90% effectiveness rate overall based on data from infections of both versions of the coronavirus.

Novavax Chief Medical Officer Filip Dubovsky said the performance in South Africa suggests there may still be a case for using it in areas where the South African variant is dominant.

Dubovsky said that Novavax is still planning to file for authorization from UK regulators early in the second quarter of 2021.

In a smaller trial conducted in South Africa – where volunteers were primarily exposed to another newer, more contagious variant widely circulating there and spreading around the world – the Novavax vaccine was 55% effective, based on people without HIV, but still fully prevented severe illness.

Novavax is also developing new formulations of its vaccine to protect against emerging variants. It is all set start clinical testing of these shots in the second quarter of this year.

The company expects to use the data to submit for regulatory authorization in various countries. It is not clear when it will seek U.S. authorization or if regulators will require it to complete an ongoing trial in the United States.

Novavax expects data from a 30,000-person trial in the United States and Mexico by early April.

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