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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 3

Clinical features for pandemic (H1N1) 2009 case-patients and household contacts, Victoria, Australia, May 18–June 3, 2009

Feature No. (%) index case-patients, n = 36 No. (%) secondary case-patients, n = 18 p value*
Sign or symptom
Fever 35 (97.2) 18 (100) 0.67
Chills 17 (47.2) 8 (44.4) 0.54
Headache 25 (69.4) 13 (72.2) 0.55
Muscle pain 20 (55.6) 8 (44.4) 0.32
Joint pain 15 (41.7) 7 (38.9) 0.54
Fatigue 30 (83.3) 16 (88.9) 0.46
Diarrhea 8 (22.2) 2 (11.1) 0.28
Vomiting 16 (44.4) 2 (11.1) 0.01
Upper respiratory tract symptoms
32 (88.9)
17 (94.4)
0.45
Sign or symptom duration, d
1–3 9 (25.0) 2 (11.2) 0.49
4–6 13 (36.1) 9 (50.0)
7–9 9 (25.1) 3 (16.7)
>10
5 (13.8)
4 (22.2)

Any medical care received
36 (100)
14 (77.8)
0.01
Reported prevention and control measures taken
Quarantine 32 (88.9) 15 (83.3) 0.43
Antiviral prophylaxis 0 1 (5.56) 0.43
Antiviral treatment 11 (33.3) 2 (11.1) 0.10

*Fisher exact test statistic used when expected value was <6.

Main Article

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

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