Effectiveness of COVISHIELD vaccine against the delta variant of SARS-CoV-2 in India
SARS-CoV-2 has affected more than 200 million people causing more than 5 million deaths worldwide as per the WHO statistics. The rise in mutant variants of SARS-CoV-2 virus has led to concerns regarding vaccine effectiveness. Delta (B.1.617.2) variant is the predominant strain in India. The vaccination programme in India is driven largely by the Covishield vaccine (ChAdOx1 nCoV-19).










