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Oral Cholera Vaccine Efficacy and Effectiveness
Katerina Rok Song1,2, Jacqueline Kyungah Lim1, Se Eun Park1,3
1International Vaccine Institute, Seoul 08826, Korea.
Vaccines
|December 28, 2021
Summary
Vaccine effectiveness studies in real-world settings provide crucial insights beyond traditional efficacy trials. Oral cholera vaccines (OCVs) demonstrate effectiveness, often enhanced by herd protection, informing public health strategies.
Area of Science:
- Public Health
- Vaccinology
- Infectious Diseases
Background:
- Cholera, an acute diarrheal illness caused by *Vibrio cholerae*, poses a significant global health challenge.
- Oral cholera vaccines (OCVs) have been developed since the 1980s, with both killed and live formulations available.
- Understanding vaccine performance in real-world conditions is vital for effective disease control.
Purpose of the Study:
- To compare vaccine effectiveness studies with traditional efficacy trials.
- To evaluate the impact of oral cholera vaccines in public health programs.
- To explore the influence of herd protection on vaccine effectiveness.
Main Methods:
- Review of existing efficacy and effectiveness studies on oral cholera vaccines.
- Analysis of data from real-world public health vaccination programs.
- Comparison of outcomes from randomized controlled trials versus observational effectiveness studies.
Main Results:
- Vaccine effectiveness studies complement traditional efficacy trials by assessing real-world impact.
- Oral cholera vaccine effectiveness in public health settings can exceed efficacy trial estimates.
- Indirect herd protection significantly contributes to the observed higher effectiveness in population-level studies.
Conclusions:
- Both efficacy and effectiveness studies are essential for a comprehensive understanding of vaccine performance.
- Real-world effectiveness data, including herd immunity effects, are critical for optimizing cholera prevention strategies.
- Oral cholera vaccines play a valuable role in controlling cholera outbreaks when implemented in public health programs.
