Pfizer, BioNTech not sure on vaccine effectiveness on new Covid variant Omicron

The pharmaceutical companies underscored that they started working on making their vaccine adaptable to new possible variants months ago.

https://ift.tt/eA8V8J The pharmaceutical companies underscored that they started working on making their vaccine adaptable to new possible variants months ago. from Zee News :India National https://ift.tt/3CWci34