Pfizer Announces It's Developing a COVID Vaccine Booster to Fight Against Delta Variant

"The first batch of the mRNA for the trial has already been manufactured at BioNTech's facility in Mainz, Germany," the companies said, adding it is anticipated that "the clinical studies to begin in August, subject to regulatory approvals."

The companies estimate that a third dose of the Pfizer vaccine will be needed 12 months after the first two doses.

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She added, "Turning the corner on this pandemic, getting back to normal, and stopping the Delta variant requires all of us to do our part and to get vaccinated."