Pfizer suggests booster shots will be needed this year, but government officials say science will dictate the timing - The Washington Post.
On Thursday, Pfizer released a statement indicating the time was near. Pfizer said its vaccine's effectiveness had eroded, citing two lines of evidence that outside scientists have yet to see in detail. That includes an Israeli government analysis showing that as the delta variant of the virus became dominant, vaccine efficacy dropped. The study has not yet been published and its conclusions have been questioned by some outside scientists. Pfizer also cited its continuing follow-up of people who were vaccinated last summer.
"While protection against severe disease remained high across the full 6 months, the observed decline in efficacy against symptomatic disease over time and the continued emergence of variants are key factors driving our belief that a booster dose will likely be necessary to maintain highest levels of protection," Pfizer said in a statement.
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