Bharat Biotech's Covid-19 vaccine Covaxin (BBV152) is effective against Delta Plus (AY.1) variant of the coronavirus, according to a study published in biorxivby the Indian Council of Medical and Research (ICMR).

"Here, we have evaluated the IgG antibody titer and neutralizing potential of sera of Covid-19 naive individuals full doses of BBV152 vaccine, Covid-19 recovered cases with full dose vaccines and breakthrough cases post-immunization BBV152 vaccines against Delta, Delta AY.1 and B.1.617.3.," the study said.