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Pfizer vaccine only slightly less effective against key South African mutations – Study

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Pfizer vaccine only slightly less effective against key South African mutations – Study

Town Press by Town Press
January 28, 2021
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Pfizer vaccine only slightly less effective against key South African mutations – Study
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Pfizer Inc and BioNTech’s COVID-19 vaccine appeared to lose only a small bit of effectiveness against an engineered virus with three key mutations from the new coronavirus variant found in South Africa, according to a laboratory study conducted by the US drug-maker.

The study by Pfizer and scientists from the University of Texas Medical Branch (UTMB), which has not yet been peer-reviewed, showed a less than two-fold reduction in antibody tighter levels, indicating the vaccine would likely be effective in neutralising a virus with the so-called E484K and N501Y mutations found in the South African variant.

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The study was conducted on blood taken from people who had received the vaccine.

Its findings are limited because it does not look at the full set of mutations found in the new South African variant.

While these findings don’t indicate the need for a new vaccine to address the emerging variants, Pfizer and BioNTech are prepared to respond if a variant of SARS-CoV-2 shows evidence of escaping immunity by the COVID-19 vaccine, the companies said.

The scientists are currently engineering a virus with the full set of mutations and expect to have results from that in around two weeks, according to Pei-Yong Shi, an author of the study and a professor at UTMB.

The results are more encouraging than another non-peer-reviewed study from scientists at Columbia University earlier on Wednesday, which used a slightly different method and showed antibodies generated by the shots were significantly less effective against the South Africa variant.

One possible reason for the difference could be that the Pfizer findings are based on an engineered coronavirus, and the Columbia study used a pseudo virus based on the vesicular stomatitis virus, a different type of virus, UTMB’s Shi said. He said he believes that finding in pseudo viruses should be validated using the real virus.

The study also showed even better results against several key mutations from the highly transmissible UK variant of the virus. She said they were also working on an engineered virus with the full set of mutations from that variant as well.

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