No. Pfizer indicated it could develop and begin mass-producing a variant-specific booster within 100 days, if a third dose of the original vaccine is ineffective. [0] But the plan is to use the existing stock.

I'd feel a lot safer if Pfizer started developing a polyvalent booster with mRNA for all significant variants.

0. http://ctmirror.org/2021/08/13/pfizer-ceo-to-public-just-tru...

The boosters in question are not at this time. Same as other shot.

It's confusing because Pfizer was touting they could modify boosters for variants months ago.