Table 4.
Maximum Monthly Storage Volume for Routine and Influenza Vaccines by Quartile of African Region Country Storage Capacity
| 25th percentile capacity | 50th percentile capacity | 75th percentile capacity | Upper Range capacity | ||
|---|---|---|---|---|---|
| Country vaccine storage capacity | % of total country capacity | Vaccine volume, L | Vaccine volume, L | Vaccine volume, L | Vaccine volume, L |
| Total country capacity | 100.0% | 173 159 | 237 433 | 304 609 | 1 605 826 |
| National level | 32.6% | 56 519 | 77 498 | 99 424 | 524 142 |
| Subnational level | 67.4% | 116 640 | 159 935 | 205 185 | 1 081 685 |
| National-level maximum monthly vaccine volumes | Vaccine volume (L) | % of national-level capacity | % of national-level capacity | % of national-level capacity | % of national-level capacity |
| Routine vaccines | 139 161 | 246.2% | 179.6% | 140.0% | 26.6% |
| <5 years influenza vaccines | 28 302 | 50.1% | 36.5% | 28.5% | 5.4% |
| Pregnant influenza vaccines | 5708 | 10.1% | 7.4% | 5.7% | 1.1% |
| Chronic diseases influenza vaccines | 15 485 | 27.4% | 20.0% | 15.6% | 3.0% |
| ≥65 influenza vaccines | 4555 | 8.1% | 5.9% | 4.6% | 0.9% |
| HCW influenza vaccines | 190 | 0.3% | 0.2% | 0.2% | <0.1% |
| Subnational-level maximum monthly vaccine volumes | Vaccine volume (L) | % of subnational-level capacity | % of subnational-level capacity | % of subnational-level capacity | % of subnational-level capacity |
| Routine vaccines | 57 472 | 49.3% | 35.9% | 28.0% | 5.3% |
| <5 years influenza vaccines | 21 168 | 12.1% | 8.8% | 6.9% | 1.3% |
| Pregnant influenza vaccines | 4269 | 2.4% | 1.8% | 1.4% | 0.3% |
| Chronic diseases influenza vaccines | 11 581 | 6.6% | 4.8% | 3.8% | 0.7% |
| ≥65 influenza vaccines | 3407 | 1.9% | 1.4% | 1.1% | 0.2% |
| HCW influenza vaccines | 142 | 0.1% | 0.1% | <0.1% | <0.1% |
We developed a vaccine flow-down schematic (Figure 1) to depict the routine vaccine doses maintained at each immunization system level by month and used it to calculate the total monthly vaccine doses and volumes stored throughout the immunization system. This table uses the maximum monthly national-level (month 10) and subnational-level (month 11) vaccine storage volumes from the schematic. The overall vaccine storage capacity for Gavi-eligible African Region countries was standardized by dividing by the <2 years country population in 2017. The range and quintiles of these values were calculated and then applied to the simulated African country. We used the median percentage of national-level stores to total stores (32.6%) and health facility stores to total stores (34.9%) from the same data set for our analyses. Immunization assumptions are in Supplementary Tables 1 and 2.
Abbreviation: HCW, healthcare workers.