The Pfizer COVID-19 vaccine produces lower levels of antibodies against the Delta variant, known as B.1.617.2 and discovered in India, according to a new study published in The Lancet.
. The team looked for “neutralizing antibodies,” or the ability of antibodies to block the virus from entering cells.
The team compared the concentrations of the neutralizing antibodies among the variants. They found that people who had been fully vaccinated with two Pfizer doses had antibodies that were 6 times lower against the B.1.617.2 variant, 5 times lower against the B.1.351 variant, and 2.6 times lower against the B.1.1.7 variant when compared to the original strain.
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