The companies have not submitted the booster for FDA approval yet.
Neither the companies nor the government recommend booster shots yet, until their safety and effectiveness can be fully explored.
A booster shot of the COVID-19 vaccine made by Pfizer and BioNTech strongly extends protection, a new study from the companies shows, and they are developing a vaccine targeted directly at the Delta variant, which first arose in India.
The companies say they have demonstrated that a third dose of their vaccine, given six months after the second, increases neutralizing antibodies five to tenfold against the original virus and the so-called Beta variant, which was first identified in South Africa. The booster was also found to be safe.
Dos dosis de Pfizer o AstraZeneca eficaces contra la variante Delta, arroja estudio
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Estudio mostró que la delta reduce a 10% efectividad de vacunas con una sola dosis
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