South Sudan’s Greater Upper Nile region is a complex environment with significant operational challenges to delivering vaccines while navigating seasonal floodings, insecurity and conflict, and cold chain constraints. The Gates Foundation has supported routine immunization strengthening in the Greater Upper Nile region of South Sudan from 2018 to 2025, implemented by Access For Humanity (AFH).
To better understand implementation successes, adaptation, and emerging lessons, the foundation commissioned Development Delivery Partners (DDP) to document the program experience in 2024 - 2025. The materials provide detailed insight into how teams are navigating these constraints, including the role of mobile outreach as a primary delivery mechanism; the importance of community systems in identifying and following up missed children; and the operational realities of maintaining cold chain functionality down to the last mile.
The lessons learned, for the use of program managers, implementers, donors operating in similar complex settings, are provided as:
Documentary videos
| Title | Author | Year | Type | Language |
|---|---|---|---|---|
| Short Documentary - Delivering Immunization at the Edge – Greater Upper Nile, South Sudan, 2026 | Development Delivery Partners | 2026 | Case study | English |
| Documentary - Delivering Immunization at the Edge – Greater Upper Nile, South Sudan, 2026 | Development Delivery Partners | 2026 | Case study | English |
| Short Documentary – Keeping Vaccines Alive – Greater Upper Nile, South Sudan, 2026 | Development Delivery Partners | 2026 | Case study | English |
| Documentary – Keeping Vaccines Alive – Greater Upper Nile, South Sudan, 2026 | Development Delivery Partners | 2026 | Case study | English |
Case reports: Full narrative reports
| Title | Author | Year | Type | Language |
|---|---|---|---|---|
| South Sudan Case Report 1: Reaching Unreached Island Communities | Development Delivery Partners | 2026 | Case study | English |
| South Sudan Case Report 2: Community Engagement and Service Delivery through BHWs | Development Delivery Partners | 2026 | Case study | English |
| South Sudan Case Report 3: CCE Maintenance and Immunization Continuity in Fragile Settings | Development Delivery Partners | 2026 | Case study | English |
| South Sudan Case Report 4: Deployment of Portable Cold Chain Devices | Development Delivery Partners | 2026 | Case study | English |
Case summaries: Two-page summary of key insights
| Title | Author | Year | Type | Language |
|---|---|---|---|---|
| South Sudan Summary 1: Reaching Unreached Island Communities | Development Delivery Partners | 2026 | Case study | English |
| South Sudan Summary 2: Community Engagement and Service Delivery Through BHWs | Development Delivery Partners | 2026 | Case study | English |
| South Sudan Summary 3: CCE Maintenance and Immunization Continuity | Development Delivery Partners | 2026 | Case study | English |
| South Sudan Summary 4: Deployment of Portable Cold Chain Devices | Development Delivery Partners | 2026 | Case study | English |