Sisonke phase 3B open-label study: Lessons learnt for national and global vaccination scale-up during epidemics

Area of Science:

• Vaccinology
• Public Health
• Epidemiology

Background:

• The Sisonke study was a Phase 3B implementation trial for healthcare workers in South Africa.
• It aimed to assess severe COVID-19 outcomes, including hospitalizations and deaths, over two years.

Purpose of the Study:

• To evaluate the effectiveness of a COVID-19 vaccine implementation strategy among healthcare workers.
• To identify key lessons for strengthening national and global vaccination strategies.

Main Methods:

• A multicentre, open-label, single-arm study design was employed.
• Vaccinations were administered nationally between February and May 2021, with a sub-study extending vaccination efforts.
• Prospective surveillance for severe COVID-19 was conducted for two years.

Main Results:

• The study successfully enrolled and vaccinated a significant number of healthcare workers.
• Ten critical lessons were identified to enhance vaccine implementation, covering public engagement, data management, site accessibility, and safety monitoring.

Conclusions:

• Effective vaccine strategies require consistent advocacy, robust data systems, and accessible vaccination sites.
• Prioritizing safety through rapid assessments, transparent communication on adverse events, and efficient surveillance is paramount for successful vaccination campaigns.