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As COVID-19 vaccine manufacturers await U.S. Food and Drug Administration approval on booster shots, millions of fully vaccinated Americans wonder about the next step forward amid the ongoing pandemic.
Coronavirus cases jumped this summer as the highly transmissible delta variant spread, packing hospitals and leading officials to reverse guidance on face masks.
However, more than one-third of Americans eligible for the shots aren’t yet fully vaccinated, according to data from the U.S. Centers for Disease Control and Prevention (CDC).
Although the agency reports that 182 million are fully vaccinated – with more than 212 million receiving at least one dose – immunity against the mutating virus remains a concern.
Some research has shown that coronavirus vaccines have lost their effectiveness over time, though experts have concluded that boosters were not necessary for most younger and healthier Americans without high-risk jobs.
In a recent and controversial study using data from both the U.S. and Israel in “the context of the delta variant,” Pfizer Inc. said there was a “strong effect of waning immunity in all age groups after six months,” supporting the company’s request for a third dose to be given about six months after the second dose in eligible individuals 16 years and older.
The company – which awaits the FDA’s judgment – said immunity against milder infection wanes approximately six to eight months after the second dose.
In this Dec. 22, 2020, file photo, medical workers prepare to manually prone a COVID-19 patient in an intensive care unit at Providence Holy Cross Medical Center in the Mission Hills section of Los Angeles.
(AP Photo/Jae C. Hong, File)
The CDC said real-world data shows protection against severe illness, hospitalizations and deaths is holding strong.
However, in one recent study, protection against infection fell as the delta variant hit: It was 91% in the spring but down to 78% in June and July.
In addition, the CDC has reportedly seen a hint that for people 75 and older, protection against hospitalizations slightly declined over the summer.
Moderna Inc. has also posted its own study of waning immunity that compared approximately 14,000 people who had received the first dose a year ago with another 11,000 vaccinated around eight months ago.
The company concluded that the more recently vaccinated group had a 36% lower rate of “breakthrough” infections compared with those vaccinated longer ago.
The U.S. already offers an extra dose of the Pfizer-BioNTech or Moderna vaccines – at least 28 days after getting the second shot – to people with severely weakened immune systems.
Nevertheless, scientists have been divided over the use of boosters and who should receive them, as well as the evidence for waning immunity and what should be done about it.
Speaking at a coronavirus summit on Wednesday, President Biden assured that the U.S. would continue to lead the world in its response to COVID-19.
Nearly 679,000 Americans have died since the beginning of the pandemic last year, according to the John’s Hopkins Coronavirus Resource Center.
The Associated Press contributed to this report.
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