Covaxin booster dose may give long-term immunity: Bharat Biotech

90% of recipients had a detectable neutralising antibody response against the wild-type strain (6 months after the second dose), the Hyderabad-based vaccine maker said

Booster shot of Bharat Biotech’s whole-virus inactivated Covid-19 vaccine Covaxin (BBV152) may give long-term immunity against Sars-CoV-2 infection, showed a study.

The Hyderabad-based vaccine maker said on Saturday that the booster dose study showed ‘promising’ results. The phase 2, double blind, randomised controlled Covaxin trial demonstrated long-term safety with no serious adverse events, it said. The booster shot was given six months after the second Covaxin dose.

“The analysis showed, six months after a two-dose BBV152 vaccination series cell-mediated immunity and neutralising antibodies to both homologous (D614G) and heterologous strains (Alpha, Beta, Delta, and Delta plus) persisted above baseline, although the magnitude