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Pfizer tests out third dose of vaccine in hopes it protects from other variants

Posted at 11:40 AM, Feb 25, 2021

Pfizer is testing out a a third dose of its COVID-19 vaccine to see if helps protect against new coronavirus variants.

The third dose is exactly the same as the previous 2.

Participants will receive a third dose 6 to 12 months after their earlier two doses.

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Then scientists will look at if they develop antibodies that protect against new virus strains.

Pfizer is also talking to regulators about the possibility of testing a modified version of its vaccine against those variants.