Table 1.
Serotype distribution in each age group (n > 10 isolates) in Portugal, 2016–2018.
| Serotype | No of isolates (%) | CAa | ||
|---|---|---|---|---|
| (18, 49) years | (50, 64) years | ≥65 years | ||
| 3 | 32 (13.0) | 54 (16.8) | 82 (14.1) | 0.915 |
| 11A | 21 (8.5) | 25 (7.8) | 56 (9.6) | 0.493 |
| 19F | 22 (8.9) | 22 (6.8) | 26 (4.5) | 0.011 |
| 23A | 11 (4.5) | 19 (5.9) | 32 (5.5) | 0.632 |
| 23B | 6 (2.4) | 15 (4.7) | 41 (7.1) | 0.001 |
| 9N | 14 (5.7) | 14 (4.3) | 32 (5.5) | 0.933 |
| 8 | 16 (6.5) | 15 (4.7) | 12 (2.1) | 0.001 |
| 29/35B | 7 (2.8) | 13 (4.0) | 23 (4.0) | 0.499 |
| 6C | 11 (4.5) | 11 (3.4) | 17 (2.9) | 0.272 |
| 22F | 6 (2.4) | 8 (2.5) | 25 (4.3) | 0.119 |
| 15A | 4 (1.6) | 8 (2.5) | 26 (4.5) | 0.024 |
| 15B/C | 11 (4.5) | 8 (2.5) | 17 (2.9) | 0.339 |
| 10A | 6 (2.4) | 7 (2.2) | 21 (3.6) | 0.266 |
| 19A | 11 (4.5) | 8 (2.5) | 13 (2.2) | 0.099 |
| 35F | 5 (2.0) | 13 (4.0) | 13 (2.2) | 0.812 |
| 31 | 10 (4.1) | 7 (2.2) | 12 (2.1) | 0.128 |
| 14 | 6 (2.4) | 7 (2.2) | 15 (2.6) | 0.841 |
| 16F | 4 (1.6) | 5 (1.6) | 16 (2.8) | 0.232 |
| NT | 6 (2.4) | 11 (3.4) | 7 (1.2) | 0.121 |
| 20 | 2 (0.8) | 7 (2.2) | 10 (1.7) | 0.475 |
| 21 | 6 (2.4) | 5 (1.6) | 9 (1.5) | 0.461 |
| 17F | 7 (2.8) | 5 (1.6) | 5 (0.9) | 0.033 |
| 34 | 3 (1.2) | 3 (0.9) | 9 (1.5) | 0.596 |
| 33F | 1 (0.4) | 4 (1.2) | 7 (1.2) | 0.362 |
| 37 | 5 (2.0) | 2 (0.6) | 5 (0.9) | 0.203 |
aCA, Cochran Armitage test for trend. In bold are the significant p-values after FDR correction.