Table 2.
Number of surveillance system components by region and sampling frequency
| Region | Number of components by frequency of sampling rounds (and relative percentage by region, in %) | Grand total by region | |||
|---|---|---|---|---|---|
| Low (1–2 rounds) | Medium (3–4 rounds) | High (6 rounds or continuous) | None/unknown | ||
| Africa | 9 (10·59%) | 2 (2·35%) | 42 (49·41%) | 32 (37·65%) | 85 (100%) |
| Asia | 52 (22·81%) | 6 (2·63%) | 135 (59·21%) | 35 (15·35%) | 228 (100%) |
| Europe | 40 (21·39%) | 9 (4·81%) | 102 (54·55%) | 36 (19·25%) | 187 (100%) |
| America | 14 (23·73%) | 0 | 30 (50·85%) | 15 (25·42%) | 59 (100%) |
| Oceania | 1 (3·57%) | 0 | 25 (89·29%) | 2 (7·14%) | 28 (100%) |
| Grand total by sampling frequency | 116 (19·8%) | 17 (2·9%) | 334 (56·9%) | 120 (20·4%) | 587 |