The Lancet Regional Health - Southeast Asia (Mar 2023)

Safety and immunogenicity of SII-NVX-CoV2373 (COVID-19 vaccine) in adults in a phase 2/3, observer-blind, randomised, controlled studyResearch in context

  • Prasad S. Kulkarni,
  • Abhijit Kadam,
  • Sheela Godbole,
  • Varsha Bhatt,
  • Abhishek Raut,
  • Sunil Kohli,
  • Santanu Tripathi,
  • Praveen Kulkarni,
  • Rakhi Ludam,
  • Madhav Prabhu,
  • Ashish Bavdekar,
  • Nithya J. Gogtay,
  • Sushant Meshram,
  • Tamilarasu Kadhiravan,
  • Sonali Kar,
  • D.H. Ashwath Narayana,
  • Clarence Samuel,
  • Govind Kulkarni,
  • Abhay Gaidhane,
  • Dipu Sathyapalan,
  • Sidram Raut,
  • Vijay Hadda,
  • Hira Lal Bhalla,
  • Chetanraj Bhamare,
  • Abhijeet Dharmadhikari,
  • Joyce S. Plested,
  • Shane Cloney-Clarke,
  • Mingzhu Zhu,
  • Melinda Pryor,
  • Stephanie Hamilton,
  • Madhuri Thakar,
  • Ashwini Shete,
  • Manish Gautam,
  • Nivedita Gupta,
  • Samiran Panda,
  • Umesh Shaligram,
  • Cyrus S. Poonawalla,
  • Balram Bhargava,
  • Bhagwat Gunale,
  • Dhananjay Kapse,
  • Shubhangi A. Kanitkar,
  • Arjun L. Kakrani,
  • Srikanth P. Tripathy,
  • Abhijit V. Tilak,
  • Akshay A. Dhamne,
  • Shahzad Beg Mirza,
  • Prachi V. Athavale,
  • Mandakini Bhowmik,
  • Parag J. Ratnakar,
  • Subodh Gupta,
  • Vijayshri Deotale,
  • Jyoti Jain,
  • Ashwini Kalantri,
  • Vineet Jain,
  • Nidhi Goyal,
  • Alok Arya,
  • Temsunaro Rongsen-Chandola,
  • Shreyasi Dasgupta,
  • Pratibha Periera,
  • Vanmathi A,
  • Anand Kawade,
  • Arunkumar Gondhali,
  • Palvi Kudyar,
  • Abhishek Singh,
  • Ravi Yadav,
  • Alina Alexander,
  • Venugopalan Gunasekaran,
  • Sekar Dineshbabu,
  • P.C. Samantaray,
  • H.S. Ravish,
  • Deepshikha Kamra,
  • Shilpa Gaidhane,
  • Quazi Syed Zahiruddin,
  • Merlin Moni,
  • Anil Kumar,
  • Ameet Dravid,
  • Anant Mohan,
  • Tejas Suri,
  • Tejas K. Patel,
  • Surekha Kishore,
  • Rahul Choche,
  • Deepak Ghatage,
  • Sugam Salvi

Journal volume & issue
Vol. 10
p. 100139

Abstract

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Summary: Background: NVX-CoV2373, a Covid-19 vaccine was developed in the USA with ∼90% efficacy. The same vaccine is manufactured in India after technology transfer (called as SII-NVX-CoV2373), was evaluated in this phase 2/3 immuno-bridging study. Methods: This was an observer-blind, randomised, phase 2/3 study in 1600 adults. In phase 2, 200 participants were randomized 3:1 to SII-NVX-CoV2373 or placebo. In phase 3, 1400 participants were randomized 3:1 to SII-NVX-CoV2373 or NVX-CoV2373 (940 safety cohort and 460 immunogenicity cohort). Two doses of study products (SII-NVX-CoV2373, NVX-CoV2373 or placebo) were given 3 weeks apart. Primary objectives were to demonstrate non-inferiority of SII-NVX-CoV2373 to NVX-CoV2373 in terms of geometric mean ELISA units (GMEU) ratio of anti-S IgG antibodies 14 days after the second dose (day 36) and to determine the incidence of causally related serious adverse events (SAEs) through 180 days after the first dose. Anti-S IgG response was assessed using an Enzyme-Linked Immunosorbent Assay (ELISA) and neutralizing antibodies (nAb) were assessed by a microneutralization assay using wild type SARS CoV-2 in participants from the immunogenicity cohort at baseline, day 22, day 36 and day 180. Cell mediated immune (CMI) response was assessed in a subset of 28 participants from immunogenicity cohort by ELISpot assay at baseline, day 36 and day 180. The total follow-up was for 6 months. Trial registration: CTRI/2021/02/031554. Findings: Total 1596 participants (200 in Phase 2 and 1396 in Phase 3) received the first dose. SII-NVX-CoV2373 was found non-inferior to NVX-CoV2373 (anti-S IgG antibodies GMEU ratio 0.91; 95% CI: 0.79, 1.06). At day 36, there was more than 58-fold rise in anti-S IgG and nAb titers compared to baseline in both the groups. On day 180 visit, these antibody titers declined to levels slightly lower than those after the first dose (13–22 fold-rise above baseline). Incidence of unsolicited and solicited AEs was similar between the SII-NVX-CoV2373 and NVX-CoV2373 groups. No adverse event of special interest (AESI) was reported. No causally related SAE was reported. Interpretation: SII-NVX-CoV2373 induced a non-inferior immune response compared to NVX-CoV2373 and has acceptable safety profile. Funding: SIIPL, Indian Council of Medical Research, Novavax.

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