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Pfizer COVID-19 vaccine’s protection against severe disease holds steady over six months


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Virus Outbreak Palestine Photo by Majdi Fathi/NurPhoto via Getty Images

The Pfizer / BioNTech COVID-19 vaccine’s protection against severe cases of the disease holds steady after six months, according to new data released by the companies. But its ability to protect people from developing any symptoms of the disease dropped over time, the analysis showed.

The data could add to the debate around if and when people may need booster doses of the vaccines, which the Biden administration, Centers for Disease Control and Prevention, and other experts have been deliberating on for the past few months. The issue became more pressing when cases of COVID-19 in the United States started to surge as the Delta variant spread.

Overall, the vaccine was 91 percent effective against symptomatic COVID-19 over six months. It...

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