Pfizer, Moderna working on booster shots targeting variants

Pfizer and Moderna say they’re working on booster shots targeting coronavirus variants, should the strains prove resistant to the existing vaccines.

“We are already laying the groundwork to respond quickly if a variant of SARS-CoV-2 shows evidence of escaping immunity by our vaccine,” Pfizer tells Reuters.

Moderna, meanwhile, said Monday it would work on a booster tailored to the South African variant.

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