Preliminary data from Scotland showed a single shot of Covid-19 vaccines developed by Pfizer Inc. and AstraZeneca PLC substantially reduced the risk of hospitalization with the disease.
A study published online reported that the risk of hospitalization with Covid-19 among those vaccinated with the Pfizer shot was 85% lower than unvaccinated individuals between 28 and 34 days after injection. There were 94% fewer hospitalizations among those vaccinated with the AstraZeneca shot than among those unvaccinated.
The findings, which haven't yet been peer-reviewed, add to a growing body of international evidence that vaccines have a significant effect on the severity of disease.
The Scottish study examined health records associated with 5.4 million people, making it one of the largest such studies to date.
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