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Delta, now a 'variant of concern,' accounts for 10 percent of new U.S. cases, CDC says
By Erika Edwards & Sara G. Miller
Covid: Lockdown easing in England to be delayed by four weeks
Boris Johnson delays end of England's coronavirus restrictions as delta variant cases climb
By Paul Schemm, Adam Taylor & Jennifer Hassan
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Delta variant doubles risk of COVID hospitalisation - Scottish study
By Nick Macfie & Alistair Smout
Headache and runny nose linked to Delta variant
By Michelle Roberts