Claims about Pfizer’s COVID-19 vaccine effectiveness clarified

Booster shots are now available to people who received the Pfizer COVID-19 vaccine and completed their set of shots six months ago. So, does that mean people who received the shot six months ago but have not gotten a booster are at risk?

One commentator on Instagram said, “It’s been confirmed that the Pfizer vaccine isn’t guaranteed after six months.” The post was written by Kimberly Klacik of Baltimore who lost her bid for a US House seat in 2020.

The CDC said the vaccine was never guaranteed, “COVID-19 vaccines are effective and are a critical tool to bring the pandemic under control; however, no vaccine is 100% effective at preventing illness. Some fully vaccinated people will get sick, and some will even be hospitalized or die from COVID-19.”

Pfizer’s vaccine does lose some efficacy, but not all, over time.

A study of millions of vaccine recipients done by Pfizer and peer-reviewed showed the real-world effectiveness of the vaccine against hospital admissions is 90% for up to six months.

In clinical trials, the vaccine’s efficacy drops to 47% after five months.

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Reporter:Peter Fleischer
Writer:Matthew Seaver
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