India, June 12 -- The variant, NB.1.8.1, has been informally dubbed 'Nimbus' and causes a severe sore throat that's been likened to 'razor blades'. The World Health Organisation (WHO) is monitoring it, as this latest mutation of the contagious virus already makes up over 10 percent of cases in Asia, Salon said in a June 11 report. The portal added that NB.1.8.1 has now been detected in multiple countries, including the US and Canada. Also read | Covid-19 comeback: Here's why coronavirus is spreading again and new symptoms you should watch out for

The Covid-19 variant NB.1.8.1, also known as Nimbus, is a descendant of the Omicron family and has been classified as a Variant Under Monitoring (VUM) by the WHO. To mitigate the spread of NB. 1...