A team of Harvard research scientists, publishing in the New England Journal of Medicine, have found that SARS-CoV-2 virus has mutated so much that the Pfizer mRNA vaccines developed against the original Wuhan strain now have little to no effect.
The study, “Neutralization Escape by SARS-CoV-2 Omicron Subvariants BA.2.12.1, BA.4, and BA.5,” evaluated neutralizing antibody titers of participants vaccinated with the Pfizer vaccine, against multiple SARS-CoV-2 strains.
The scientists found that the titers dropped from 5,783 (against the WA1/2020 isolate, Wuhan strain) to 275 (against the BA.4 or BA.5 subvariant, omicron variants), by a factor of 21.
In other words, they found the mRNA vaccine to be essentially ineffective against Omicron variants currently in circulation….