The Delta coronavirus variant surging across Greater Sydney and around the world appears to cause more severe illness and spread as easily as chickenpox, according to an internal document from the US Centres for Disease Control and Prevention.The document - a slide presentation - outlines unpublished data that shows fully vaccinated people might spread the Delta variant at the same rate as unvaccinated people.CDC Director Dr Rochelle Walensky confirmed the authenticity of the document, which was first reported by The Washington Post.
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