Table 1

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

Kate A. Ward, Paul Armstrong, Jeremy M. McAnulty

, 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

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
Demographic	No. (%) passengers, n = 1,970	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.

Main Article

Page created: March 04, 2011

Page updated: March 04, 2011

Page reviewed: March 04, 2011

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