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Volume 16, Number 11—November 2010

Research

Outbreaks of Pandemic (H1N1) 2009 and Seasonal Influenza A (H3N2) on Cruise Ship

Kate A. Ward, Paul Armstrong, Jeremy M. McAnultyComments to Author , Jenna M. Iwasenko, and Dominic E. Dwyer
Author affiliations: New South Wales Health, Sydney, New South Wales, Australia (K.A. Ward, J.M. McAnulty); Western Australian Department of Health, Perth, Western Australia, Australia (P. Armstrong); South Eastern Area Laboratory Services, Sydney (J.M. Iwasenko); Institute of Clinical Pathology and Medical Research, Sydney (D.E. Dwyer)

Main Article

Table 1

Demographics for passengers with influenza after 10-day cruise that departed Sydney, NSW, Australia, on May 16, 2009*

Demographic No. (%) passengers,
n = 1,970 Confirmed pandemic (H1N1) 2009, n = 78
Confirmed influenza A (H3N2), n = 100
No. (%) RR (95% CI) p value No. (%) RR (95% CI) p value
Age group, y
<3 13 (1) 0 0 1.00 1 (1) 1.52 (0.23–10.16) 0.67
3–6 48 (2) 20 (26) 17.43 (10.45–29.09) <0.001 4 (4) 1.64 (0.62–4.36) 0.32
7–12 119 (6) 13 (17) 4.57 (2.40–8.69) <0.001 6 (6) 1.00 (0.44–2.27) 0.99
13–18 114 (6) 2 (3) 0.73 (0.18–3.06) 1.00 5 (5) 0.87 (0.35–2.12) 0.75
19–35 369 (19) 18 (23) 2.04 (1.13–3.70) 0.020 19 (19) 1.02 (0.61–1.69) 0.95
36–65 1,046 (53) 25 (32) Referent 53 (53) Referent
>65
261 (13)
0
0.00 (undefined)
0.005

12 (12)
0.91 (0.50–1.70)
0.76
Sex
M 842 (43) 35 (45) Referent 47 (47) Referent
F
1,128 (57)
43 (55)
0.92 (0.59–1.42)
0.70

53 (53)
1.19 (0.60–1.2)
0.38
Residence
NSW 1,135 (58) 47 (60) Referent 62 (62) Referent
Victoria 433 (22) 11 (14) 1.12† (0.72–1.74) 0.63 16 (16) 0.83† (0.56–1.24) 0.36
QLD 165 (8) 10 (13) 12 (12)
SA 109 (6) 4 (5) 4 (4)
WA 54 (3) 0 4 (4)
ACT 39 (2) 3 (4) 1 (1)
Tasmania 12 (1) 1 (1) 0
NT 2 (0) 0 0
Not Australia 7 (0) 2 (3) 1 (1)
Unknown 14 (1) 0 0

*Diagnosis received during 7-day period after the cruise. RR, relative risk; CI, confidence interval; –, not applicable; NSW, New South Wales; QLD, Queensland; SA, South Australia; WA, Western Australia; ACT, Australian Capital Territory; NT, Northern Territory.
†Relative risks compared NSW residents with non–NSW residents. Two co-infected case-patients have been counted in both influenza categories. The 2 case-patients with positive results from point-of-care testing on board but no further subtyping results are excluded from this table.

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