NB.1.8.1, a new COVID-19 variant that has caused concern among WHO officials, is now spreading in America, according to CDC data.

The UK has reported cases of the new Covid variant, Nimbus or NB. 1.8.1, with a rise in Covid-related hospital admissions by almost 10% in the last week of May, following a warning from the World Health Organisation (WHO). Sufferers of the new variant have described a "razor blade throat" symptom.

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