
Pfizer To Test Third Version Vaccine On South African Strain
Pfizer and BioNTech said Thursday they are studying adding a third dose to their vaccine regime and testing a new version targeting the South African variant of the coronavirus.
As countries around the world rush to vaccinate people, concerns have risen that more transmissible variants such as the one first detected in South Africa or another in Britain are more resistant to existing vaccines.
In one study, the US and German pharmaceutical firms said they would look at what happens when people are given a third dose of their two-shot vaccine, six to 12 months after the booster.
They said in a statement they are also talking to regulators about testing a modified version of their original vaccine to address the South African variant known as B.1.351.
“We are taking multiple...