Study says three doses of Pfizer COVID vaccine better than two
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Washington: A third dose of the Pfizer COVID-19 vaccine conferred higher effectiveness against infection and hospitalisation than two doses of the preventive after one month, a study has found.
The study, published in The Lancet Regional Health-Americas, assessed the effectiveness of two doses of the Pfizer COVID-19 vaccination against infection, hospitalisation, and death up to eight months after vaccination.
The researchers also assessed the effectiveness of three doses of the vaccine up to three months after vaccination.
The study evaluated electronic health records of 3.1 million members of Kaiser Permanente in Southern California from December 2020 to December 2021.
"When we looked at the effectiveness of the two doses of Pfizer-BioNTech vaccine versus three doses, we see a benefit with three doses that exceeds that achieved with two doses alone," said Sara Y Tartof from Kaiser Permanente Southern California Department of Research & Evaluation, US.
"What we see from this research is that the public health impact of a third dose to prevent severe disease is substantial," Tartof said.
"Importantly, all studies that have evaluated the vaccine effectiveness of a third dose -- including ours -- have shown a meaningful improvement in vaccine effectiveness against a broad range of SARS-CoV-2 outcomes," she added.
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