India's Covaxin Effectively Neutralises Delta Variant, Says US National Institute Of Health Results of two studies of blood serum from people who had received Covaxin suggest that the vaccine generates antibodies that effectively neutralise both Alpha and Delta variants of coronavirus. Outlook Web Desk 30 June 2021, Last Updated at 11:38 am Representational Image Outlook Web Desk 2021-06-30T07:26:01+05:30 India's Covaxin Effectively Neutralises Delta Variant, Says US National Institute Of Health outlookindia.com 2021-06-30T11:38:13+05:30 The US' National Institute of Health has said India's Covaxin, developed by Bharat Biotech in collaboration with the Indian Council of Medical Research, effectively neutralises both Alpha and Delta variants of coronavirus.