
A new Delta descendant is rising in the UK. Here's what to know
CNN
Covid-19 vaccines helped to prevent tens of thousands of deaths among seniors in the US between January and May of this year. Despite their widespread availability and efficacy, many people are refusing a shot.
This descendant of the Delta variant, known as AY.4.2, accounted for an estimated 6% of cases in the week of September 27 -- the last week with complete sequencing data -- and is "on an increasing trajectory," a report by the UK Health Security Agency said.
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