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Volume 12, Number 1—January 2006
Research

Influenza-associated Deaths in Tropical Singapore

Angela Chow*Comments to Author , Stefan Ma*, Ai Ee Ling†, and Suok Kai Chew*
Author affiliations: *Ministry of Health, Singapore; †Singapore General Hospital, Singapore

Main Article

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.

Main Article

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