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Volume 17, Number 9—September 2011
Research

Intrahousehold Transmission of Pandemic (H1N1) 2009 Virus, Victoria, Australia

Caroline van GemertComments to Author , Margaret Hellard, Emma S. McBryde, James Fielding, Tim Spelman, Nasra Higgins, Rosemary Lester, Hassan Vally1, and Isabel Bergeri
Author affiliations: Author affiliations: Burnet Institute, Melbourne, Victoria, Australia (C. van Gemert, M. Hellard, E.S. McBryde, T. Spelman, I. Bergeri); Australian National University, Canberra, Australian Capital Territory, Australia (C. van Gemert, J. Fielding, H. Vally); Monash University, Melbourne (M. Hellard); Victorian Department of Health, Melbourne (E.S. McBryde, J. Fielding, N. Higgins, R. Lester); Royal Melbourne Hospital, Melbourne (E.S. McBryde); University of Melbourne, Melbourne (E.S. McBryde); Victorian Infectious Diseases Reference Laboratory, Melbourne (J. Fielding)

Main Article

Table 4

Secondary attack rates for susceptible household contacts of index case-patients with pandemic (H1N1) 2009, Victoria, Australia, May 18–June 3, 2009*

Variable Total no. household contacts No. with influenza-like illness Secondary attack rate, % (95% CI)
Individual-level associations
Sex
M 58 5 8.62 (1.08–14.4)
F 64 13 20.3 (11.3–32.2)
Age, y
0–4 11 1 9.09 (0.230–41.3)
5–19 35 6 17.1 (6.50–33.6)
20–49 66 10 15.2 (7.51–26.1)
>50 10 1 10.0 (0.25–44.5)
Relationship to index case-patient
Parent/child/partner 65 10 15.4 (7.63–26.5)
Sibling 44 8 18.2 (8.19–32.7)
Other family member
 13
 0
 0 (0–24.7)
Prevention and control measures reported
Antiviral prophylaxis 57 1 1.8 (0.04–9.39)
Quarantined >1 d with index case-patient
 73
 15
 20.5 (12.0–31.6)
Household-level associations
No. persons
2–3 7 2 28.6 (3.67–71.0)
4–5 75 10 13.3 (6.58–23.2)
>6 40 6 15.0 (5.71–29.8)
No. children
1 31 6 19.4 (7.45–37.5)
2 47 7 14.9 (6.20–28.3)
>3 44 5 11.4 (3.79–24.6)
Cultural and linguistic diversity
Only English spoken at home 53 5 9.4 (3.13–20.7)
English and/or other language(s) spoken at home 69 13 18.8 (10.4–30.1)

*CI, confidence interval.

Main Article

1Current affiliation: La Trobe University, Melbourne, Victoria, Australia.

Page created: September 06, 2011
Page updated: September 06, 2011
Page reviewed: September 06, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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