quote:

Novavax’s Covid-19 vaccine was 96% effective in preventing cases caused by the original version of the coronavirus in a late-stage trial conducted in the United Kingdom.

The vaccine was also about 86% effective in protecting against the more contagious virus variant first discovered and now prevalent in the UK.

It was only around 55% effective in a separate, smaller trial in South Africa, where volunteers were primarily exposed to another newer, more contagious variant.