Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

Volume 19, Number 1—January 2013

Research

Seroepidemiologic Effects of Influenza A(H1N1)pdm09 in Australia, New Zealand, and Singapore

James M. TrauerComments to Author , Don Bandaranayake, Robert Booy, Mark I. Chen, Michelle Cretikos, Gary K. Dowse, Dominic E. Dwyer, Michael E. Greenberg, Q. Sue Huang, Gulam Khandaker, Jen Kok, Karen L. Laurie, Vernon J. Lee, Jodie McVernon, Scott Walter, Peter G. Markey, and for the Australia, New Zealand and Singapore Pandemic Serosurveillance Study Group
Author affiliations: Author affiliations: Melbourne Sleep Disorders Centre, East Melbourne, Victoria, Australia (J.M. Trauer); Environmental Science and Research, Wallaceville, New Zealand (D. Bandaranayake, Q.S. Huang); National Centre for Immunisation Research and Surveillance, Westmead, New South Wales, Australia (R. Booy, G. Khandaker); National University Health System, Singapore (M.I. Chen); University of Sydney, Sydney, New South Wales, Australia (M. Cretikos); Communicable Disease Control Directorate, Shenton Park, Western Australia, Australia (G.K. Dowse); Centre for Infectious Diseases and Microbiology, Westmead (D.E. Dwyer, J. Kok); CSL Limited, Parkville, Victoria, Australia (M.E. Greenberg); World Health Organization Collaborating Centre for Reference and Research in Influenza, North Melbourne, Victoria, Australia (K.L. Laurie); World Health Organization, Geneva, Switzerland (V.J. Lee); Melbourne School of Population Health, Parkville (J. McVernon); Centre for Epidemiology and Research, North Sydney, New South Wales, Australia (S. Walter; Centre for Disease Control, Tiwi, Northern Territory, Australia (P.G. Markey)

Main Article

Table 3

Postpandemic seropositive proportions by country, region, and risk group of influenza A (H1N1) 2009 in the Southern Hemisphere, winter 2009, with age-characterized AR*

Code
Pop.
Age groups, y
Sex
Overall
Age stand. AR
0–4
5–14
15–34
35–54
55–74
≥75

F
M

Raw
Age stand.
A, B, E, I, K, N, O, P, R, S Overall 27.6 34.3 30.5 16.8 18.0 23.3 23.0 22.3 23.8 24.3 14.9
I, K, N, O, P, R AU 24.0 32.2 29.8 17.8 18.8 17.0 23.3 21.2 23.1 23.7 13.1
B NZ 37.2 46.3 38.1 22.3 20.1 35.8 30.5 30.1 30.3 30.8 19.0
E, S Sing. 24.5 29.6 17.2 11.0 6.8 10.7 13.4 19.2 17.5 14.0
K, N NSW 17.3 18.4 37.8 19.3 18.8 21.6 25.5 24.2 26.2 27.2 15.3
P NT 16.7 37.2 22.0 18.1 16.3 14.3 20.5 18.3 19.5 21.8 15.0
N QLD 29.6 9.3 14.8 19.2 18.0 18.5
N Tas 35.9 28.9 26.7 35.6 24.5 30.6
N, O Vic 36.1 30.8 12.5 21.4 31.3 13.6 21.5
I, N, R
WA
24.0
39.5
31.6
18.2
34.3


27.4
27.5

31.4
30.3
20.5
Risk group collections
M NSW, HIV+ 29.5 30.4 35.6 28.4
Q NSW, hemo. 21.7 25.0 20.8 22.0 21.5
C NZ, HCWs 31.3 23.7 27.6 33.3 26.3 28.2 26.7
F Sing.
HCWs 11.0 6.8 11.1 10.1 6.3 9.5
G Sing. res. care 4.3 2.7 6.8 11.4 4.9 9.4 6.8
H Sing. military 35.7 3.4 34.5 33.9
J WA, preg. women 13.3 19.2 14.7 14.7
P NT, indig. 37.5 28.4 28.1 32.9 28.4 30.9 29.5 29.8 22.1
B NZ, Maori 42.3 26.2 20.6 39.4 28.0 34.3
B
NZ, Pacific People
56.0
55.6
53.1
39.5
24.3


43.6
45.1

43.7


Overall attack rates, community-based studies
A, B, E, I, K, N, O, P, R, S
Overall
26.2
31.6
18.5
12.1
6.4
–24.1

15.2
13.7

15.3
14.9

Overall geometric mean titers, community-based studies
A, E, I, N, P, R, S Pre 6.03 5.86 8.63 6.97 8.57 24.13 15.2 13.7 15.3 14.9
A, B, E, I, K, N, O, P, R, S Post 15.42 16.87 16.09 10.10 11.29 14.74 15.2 13.7 15.3 14.9

*Results are expressed as % (95% CI). AR, attack rate; Pop., population; Age-stand, age-standardized; AU, Australia; NZ, New Zealand; Sing., Singapore; NSW, New South Wales; NT, Northern Territory; QLD, Queensland; Tas, Tasmania; Vic, Victoria; WA, Western Australia; HCWs, health care workers; hemo., hemodialysis; res., residential; preg., pregnant; indig., indigenous; pre, prepandemic; post, postpandemic. Blank cells indicate no data.

Main Article

1A list of the group’s members can be found at the end of this article.

Top of Page

USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO