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, the US’ National Institute of Health has said.
The top American health research institute, which has a history of strong scientific collaboration with India, also said that an adjuvant developed with funding from it has contributed to the success of the highly efficacious Covaxin, which has been administered to roughly 25 million people till date in India and elsewhere.
The NIH said results of two studies of blood serum from people who had received Covaxin suggest that the vaccine generates antibodies that effectively neutralise the B.1.1.7 (Alpha) and B.1.617 (Delta) variants of SARS-CoV-2, first identified in the UK and India, respectively.
Adjuvants are substances formulated as part of a vaccine to boost immune responses and enhance a vaccine’s effectiveness.
Covaxin comprises a disabled form of SARS-CoV-2 that cannot replicate but still stimulates the immune system to make antibodies against the virus. Published results from a phase 2 trial of the vaccine indicate that it is safe and well tolerated, the NIH said, adding that safety data from a phase 3 trial of Covaxin will become available later this year.
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