'Two vaccine doses must': WHO decodes Delta variant amid third wave fear

The Covid-19 Delta variant, which was first identified in India, is becoming the dominant variant globally because of its significantly increased transmissibility. The B.1.617.2 Delta variant was first detected in India around October 2020. The World Health Organisation says that the two vaccine doses are need to ensure complete protection against this variant of Sars-CoV-2 virus.