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Continue to ChatSouth African Variant May Cut Effectiveness of Pfizer/BioNTech Vaccine By Up to 66% https://invesbrain.com/south-african-variant-may-cut-effectiveness-of-pfizer-biontech-vaccine-by-up-to-66/
South African Variant May Cut Effectiveness of Pfizer/BioNTech Vaccine By Up to 66% https://invesbrain.com/south-african-variant-may-cut-effectiveness-of-pfizer-biontech-vaccine-by-up-to-66/