Table 4.
Age distribution of confirmed influenza B cases (as a percentage of all influenza B)
| Country | Data source | No. of influenza B cases | Age distribution (years) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| <5 | 5‐9 | 10‐19 | 20‐49 | 50‐64 | ≥65 | ||||
| Australia | Surveillance (Notified influenza cases)30 | 745 | 6.4 | 45 (5‐14) | 46 (15‐49) | 10 | 13 | ||
| GP surveillance30 | 38 | 5 | 24 (5‐14) | 63 (15‐49) | 5 | 3 | |||
| Surveillance (Complications alert network)30 | 50 | 10 | 8 (5‐14) | 44 (15‐49) | 8 | 30 | |||
| Clinical samples23 | 55 | 0 | 10.9 | 0 | 34.5 | 34.5 | 20.0 | ||
| Surveillance23 | 133 | 4.5 | 10.5 | 35.3 | 24.8 | 23.3 | 6.0 | ||
| China | Clinical patients135 | 83 | 14.5 | 34.9 (5‐14) | 25.3 (15‐24) | 22.9 (25‐59) | 2.4 (≥ 60) | ||
| Clinical patients138 | 162 | 5.6 | 34.0 (5‐14) | 14.2 (15‐24) | 43.2 (25‐59) | 3.1 (≥ 60) | |||
| Clinical patients133 | 96 | 29.2 | 68.8 (5‐14) | 0 (15‐24) | 2.1 (25‐59) | 0 (≥ 60) | |||
| Clinical patients139 | 74 | 21.6 | 43.2 (5‐14) | 18.9 (15‐24) | 16.2 (25‐59) | 0 (≥ 60) | |||
| Clinical patients127 | 404 | ‐ | ‐ (5‐14) | 29.5 (15‐24) | 65.5 (25‐59) | 5.0 (≥ 60) | |||
| Clinical patients131 | 75 | ‐ | ‐ (5‐14) | 50.7 (15‐24) | 49.3 (25‐59) | 0 (≥ 60) | |||
| Clinical patients41 | 6688 | 9.7 | 23.5 (6‐17) | 61.4 (18‐64) | 5.5 | ||||
| Indonesia | Surveillance43 | 1487 | 15.0 | 33.8 (5‐12) | 8.5 (13‐17) | 38.0 (18‐49) | 3.6 | 1.1 | |
| Laos | Surveillance46 | 142 | 25.4 | 34.8 (5‐17) | 39.8 (18‐64) | 0 | |||
| Surveillance47 | 92 | 13.0 | 41.3 (5‐17) | 44.6 (18‐49) | 1.1 | 0 | |||
| Malaysia | Clinical patients142 | 338 | 73.8 | 16.4 | 8.2 | 1.6 | ‐ | ‐ | |
| Myanmar | Clinical patients51 | 125 | 43.2 | 32.6 | 13.8 | 2.2 (20‐59) | 0 (≥ 60) | ||
| Clinical patients50 | 6 | 33 | 50 | 16.7 | 0 | 0 | 0 | ||
| PNG | Surveillance56 | 38 | 76 | 24 (>5) | |||||
| Singapore | Clinical samples82 | 92 | 45.3 | 10.5 | 8.2 | 36.0 (≥ 20) | |||
| South Korea | Surveillance76 | 3217 | 48.7 | 18.4 | 5.0 | 7.7 | 6.5 | 13.1 | |
| Thailand | Surveillance83 | 120 | 25.8 | 43.8 (5‐17) | 12.5 (18‐49) | 15.6 | 12.5 | ||
| Surveillance84 | 150 | 26 | 34.7 (5‐17) | 18.7 (18‐49) | 20.7 (≥ 50) | ||||
| Vietnam | Surveillance58 | 585 | 22 | 41.5 (5‐14) | 17.4 (25‐64) | 1.7 | |||
| Surveillance59 | 2163 | 68 (0‐15) | 11.8 (16‐24) | 18.0 (25‐64) | 1.8 | ||||
N, number; PNG, Papua New Guinea; GP, general practice; ILI, influenza‐like illness; LRTI, lower respiratory tract infection. Shading indicates values covering the combined shaded age groups.