A relatively new and seemingly highly contagious variant of Covid, NB.1.8.1, or the “Nimbus” variant, has been described by the World Health Organisation (WHO) as a “variant under monitoring” (VUM). That’s partly because it seems to be so easily transmissible,

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.