New Delhi, June 21:

A World Health Organization (WHO epidemiologist on Monday said that a reduced efficacy against the Delta coronavirus variant is being seen. However, the vaccines are still found to be effective at preventing severe illness and death.

The WHO official added that in the future, there might a “constellation of mutations” which means vaccines are likely to lose their potency against fighting the coronavirus.

The Delta plus variant has been formed due to a mutation in the Delta or B.1.617.2 variant, first identified in India and considered one of the drivers of the second wave in the country and also in several others including the UK.