The BioNTech/Pfizer Covid-19 vaccine appears to be significantly less effective against the virus variant that emerged in South Africa, according to a study published on Wednesday.
The vaccine still works against the strain known as 501Y.V2, but the shot produced only a third of the antibodies that it did for the original virus in a lab study using an engineered virus.
The partners said there was “no clinical evidence” that people vaccinated with their Covid-19 shot lacked protection against the variant. It is hard to draw firm conclusions from lab experiments on how the vaccines will work on the variants in humans.
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