Pfizer-BioNTech to test third dose of Covid vaccine

Pfizer-BioNTech to test third dose of Covid vaccine
New York, Feb 26 (Ians) Pharmaceutical companies Pfizer and BioNTech said that they have begun an evaluation of the safety and immunogenicity of a third dose of the Pfizer-BioNTech Covid-19 vaccine (BNT162b2).

It is to understand the effect of a booster on immunity against Covid-19 caused by the circulating and potential newly emerging Sars-CoV-2 variants, the companies said in a statement on Thursday.

"While we have not seen any evidence that the circulating variants result in a loss of protection provided by our vaccine, we are taking multiple steps to act decisively and be ready in case a strain becomes resistant to the protection afforded by the vaccine," said Albert Bourla, Chairman and Chief Executive Officer, Pfizer.

"This booster study is critical to understanding the safety of a third dose and immunity against circulating strains," Bourla added.

The study will draw upon participants from the Phase 1 study in the US
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