Table 2.
Annual sum of total specimens tested and specimens positive for influenza by subtypes in Guangzhou, Hong Kong and Singapore, 2004–2006.
| Year | Virus type | Guangzhou | Hong Kong | Singaporea |
|---|---|---|---|---|
| 2004 | Test specimens | 1895 | 28,345 | 7783 |
| A + B | 117 | 4956 | 294 | |
| A/H3N2 | 100 (85.5%)b | 4605 (92.9%) | 67 (38.7%) | |
| A/H1N1 | 0 (0.0%) | 27 (0.5%) | 9 (5.2%) | |
| B | 17 (14.5%) | 324 (6.5%) | 97 (56.1%) | |
| 2005 | Test specimens | 1856 | 41,003 | 10,441 |
| A + B | 266 | 5894 | 462 | |
| A/H3N2 | 164 (61.7%) | 4511 (76.5%) | 75 (44.6%) | |
| A/H1N1 | 67 (25.2%) | 429 (7.3%) | 30 (17.9%) | |
| B | 35 (13.2%) | 954 (16.2%) | 63 (37.5%) | |
| 2006 | Test specimens | 1865 | 36,419 | 11,105 |
| A + B | 184 | 3881 | 535 | |
| A/H3N2 | 1 (0.5%) | 208 (5.4%) | 33 (14.9%) | |
| A/H1N1 | 115 (62.5%) | 2797 (72.1%) | 44 (19.8%) | |
| B | 68 (37.0%) | 876 (22.6%) | 145 (65.3%) | |
| Total | Test specimens | 5616 | 105,767 | 29,329 |
| A + B | 567 | 14,731 | 1291 | |
| A/H3N2 | 265 (46.7%) | 9324 (63.3%) | 175 (31.1%) | |
| A/H1N1 | 182 (32.1%) | 3253 (22.1%) | 83 (14.7%) | |
| B | 120 (21.2%) | 2154 (14.6%) | 305 (54.2%) |
a
Sum of influenza subtypes for Singapore is not equal to A + B because the specimens for subtyping were different from those tested for A + B.
b
Proportions of subtype in total positive specimens for influenza A + B.