Safety and immunogenicity of MVC-COV1901 vaccine in older adults: Phase 2 randomized dose-comparison trial

Alexander Waits, Jau Yuan Chen, Wei Hong Cheng, Jih I. Yeh, Szu Min Hsieh, Charles Chen, Robert Janssen, Chia En Lien, Tzou Yien Lin

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Introduction: Older adults are subject to higher COVID-19 infection and mortality rates. Safety and immunogenicity of MVC-COV1901, a protein subunit vaccine have been demonstrated in phase 2 clinical trial for the general population, and negative correlations have been observed between immune responses and age, however, older adults were under-represented. Methods: A double-blind, randomized, multi-center study compared safety and immunogenicity of high-dose (25 mcg) to mid-dose (15 mcg) of MVC-COV1901 administered 2 times 28 days apart in 420 participants of 65 years and older. The results have been stratified by the comorbidity status. Results: Both high and mid-dose regimens elicited mostly mild adverse events and robust immune responses when measured as neutralizing and binding antibodies titers. High doses elicited better immune responses in the group without comorbidities. Conclusion: Given the general population-associated safety and immunogenicity of MVC-COV1901, we recommend high dose for immunization of elder adults with MVC-COV1901. The clinical trial was registered at (NCT04822025).

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalInternational Journal of Infectious Diseases
Publication statusPublished - Nov 2022


  • Immunogenicity
  • Immunosenescence
  • MVC-COV1901 vaccine
  • Older adults
  • SARS-Cov-2

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases


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