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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
Boris Johnson extends current lockdown rules in England due to concerns over delta Covid variant
By Elliot Smith
Headache and runny nose linked to Delta variant
By Michelle Roberts