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. McAnulty
, Jenna M. Iwasenko, and Dominic E. Dwyer
, Jenna M. Iwasenko, and Dominic E. Dwyer
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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Page updated: March 04, 2011
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