COVAXIN™ – Phase 1 Study Results

by Bharatbiotech
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COVAXIN™ (BBV152) demonstrated acceptable safety profile and high immune response, which induced T-cell responses in Phase 1 study.


  • In a Phase 1 placebo-controlled, double-blinded clinical trial, an inactivated SARS-CoV-2 vaccine (BBV152) was evaluated in 375 subjects.
  • On day 28 (14 days after 2nd dose), all subjects who received the vaccine intramuscularly had significantly elevated Spike binding IgG antibodies and Neutralizing Antibody titers.
  • The vaccine induced antibody responses reported, were able to neutralize both homologous (vaccine virus strain) and heterologous (divergent) SARS-CoV-2 strains.
  • A Th1 biased T-cell response was observed.
  • Local reactions and systemic events after immunization were generally mild in nature and resolved transiently. No serious (grade 3-4) adverse events were reported.


BBV152 induced binding and neutralizing antibody responses & with the inclusion of the Algel-IMDG adjuvant, this is the first inactivated SARS-CoV-2 vaccine that has been reported to induce a Th1-biased response. Phase 2 trials are in analysis and phase 3 clinical trials are underway.

Full study is available at 

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