Volume 12, Number 1—January 2006
Research
Influenza-associated Deaths in Tropical Singapore
Angela Chow*
, Stefan Ma*, Ai Ee Ling†, and Suok Kai Chew*
, Stefan Ma*, Ai Ee Ling†, and Suok Kai Chew*
Table 1
Annual influenza virus and respiratory syncytial virus (RSV) surveillance data, Singapore, 1996–2003
| Year | Influenza virus |
|||||||
|---|---|---|---|---|---|---|---|---|
| Influenza type* |
Influenza A subtype† |
RSV |
||||||
| No. specimens tested | Influenza A-positive test results (%) | Influenza B-positive test results (%) | No. specimens tested | A (H1N1)-positive isolates (%) | A (H3N2)-positive isolates (%) | No. specimens tested | Total positive test results (%) | |
| 1996 | 5,140 | 132 (2.6) | 47 (0.9) | 924 | 1 (0.1) | 15 (1.6) | 4,249 | 868 (20.4) |
| 1997 | 5,255 | 208 (4.0) | 39 (0.7) | 1,041 | 9 (0.9) | 17 (1.6) | 4,441 | 902 (20.3) |
| 1998 | 8,934 | 817 (9.1) | 120 (1.3) | 941 | 3 (0.3) | 40 (4.3) | 7,573 | 1,683 (22.2) |
| 1999 | 7,548 | 714 (9.5) | 74 (1.0) | 1,001 | 1 (0.1) | 99 (9.9) | 6,915 | 1,004 (14.5) |
| 2000 | 7,716 | 397 (5.1) | 122 (1.6) | 974 | 34 (3.5) | 61 (6.3) | 7,094 | 1,425 (20.1) |
| 2001 | 8,171 | 300 (3.7) | 76 (0.9) | 1,023 | 33 (3.2) | 44 (4.3) | 7,445 | 1,415 (19.0) |
| 2002 | 8,317 | 274 (3.3) | 34 (0.4) | 897 | 3 (0.3) | 58 (6.5) | 7,840 | 1,128 (14.4) |
| 2003 | 5,979 | 454 (7.9) | 21 (0.4) | 1,130 | 6 (0.5) | 121 (10.7) | 5,813 | 678 (11.7) |
| Mean | 7,133 | 412 (5.8) | 67 (0.9) | 991 | 11 (1.1) | 57 (5.7) | 6,421 | 1,138 (17.8) |
*Respiratory specimens were tested for influenza by virus isolation, direct antigen detection, and serologic tests.
†Influenza A isolates obtained from virus isolation were subtyped by using strain-specific antisera from the Centers for Disease Control and Prevention, Atlanta, GA, USA.
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