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Review of Covid-19 vaccine clinical trials - A puzzle with missing pieces

Hang Fai Kwok1

  • 1Institute of Translational Medicine, Faculty of Health Sciences, University of Macau, Avenida de Universidade, Taipa, Macau SAR.

International Journal of Biological Sciences
|April 28, 2021
PubMed

Insights

This review examines COVID-19 vaccines, including mRNA, protein, and viral vector types, focusing on Phase III trial data. It addresses vaccine efficacy in specific populations and against new variants, highlighting remaining knowledge gaps.

Area of Science:

  • * Vaccinology and infectious disease research.
  • * Clinical trial analysis and public health.
  • * Biotechnology and pharmaceutical development.

Background:

  • * Multiple COVID-19 vaccine candidates utilizing diverse technologies (mRNA, recombinant protein, adenoviral vector, inactivated virus) have completed Phase III trials.
  • * Existing clinical trial data has limitations regarding participant diversity, geographic representation, and evolving viral dynamics.
  • * Critical knowledge gaps persist concerning vaccine performance in specific demographics and against emerging SARS-CoV-2 variants.

Purpose of the Study:

  • * To review COVID-19 vaccine candidates with available Phase III clinical trial data.
  • * To critically assess the scientific evidence regarding vaccine safety and efficacy across diverse populations.
  • * To identify and discuss uncertainties surrounding vaccine effectiveness against asymptomatic infections and new viral strains.

Main Methods:

  • * Comprehensive literature review of published Phase III clinical trial data for COVID-19 vaccines.
  • * Analysis of vaccine efficacy and safety profiles reported in trial publications.
  • * Comparative assessment of vaccine performance across different technological platforms and participant subgroups.

Main Results:

  • * Phase III trials demonstrate varying degrees of safety and efficacy for different vaccine platforms.
  • * Data on elderly populations, pregnant/breastfeeding females, and adolescents remains limited.
  • * Efficacy against asymptomatic COVID-19 and specific viral variants is not yet well-established across all vaccine types.

Conclusions:

  • * While several COVID-19 vaccines show promise, further research is crucial for specific populations.
  • * Understanding vaccine effectiveness against emerging variants and asymptomatic transmission requires ongoing investigation.
  • * Continued monitoring and data collection are essential for comprehensive vaccine deployment strategies.
Keywords:
Different subgroupsPandemicSARS-CoV-2VaccinationViral Variants

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