U.K. Covid Cases at Highest Level as Immunity Wanes, Study Finds
- Prevalence rate doubled in March from a month earlier
- Rate of Covid-19 is growing among older adults over 55
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Covid-19 infections in England reached their highest level in March since the pandemic began, driven by the omicron subvariant BA.2 and waning immunity among older adults, according to a new study.
The overall Covid prevalence rate more than doubled last month from February when infection rates were falling from the omicron-led January peak, the React-1 study led by Imperial College London found. Since then the emergence of BA.2 -- a more-transmissible version of omicron- has accelerated new infections and become the dominant strain in England, accounting for about 90% of the samples that tested positive.