Delta variant, detected first in India and named so by the World Health Organisation (WHO), is now a Sars-2 variant of global concern. Studies showed that the Delta variant was behind the second wave of Covid-19 pandemic in India. But India has a new worry, another mutant variant, the Delta Plus.

It is the gen-next of the Sars-2 coronavirus -- a mutant of the Delta version. The Delta Plus variant is technically named B.1.617.2.1 or AY.1.

While the Delta variant was first discovered in India last year and has made health authorities nervous in Europe and elsewhere, the Delta Plus variant was detected first in Europe in March this year and is giving chills to authorities in India.