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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)

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Table 2

Clinical data for 100 passengers with influenza after 10-day cruise that departed Sydney, New South Wales, Australia, on May 16, 2009

Clinical data Pandemic (H1N1) 2009, no. (%),
n = 50* Influenza (H3N2), no. (%),
n = 50† p value
Cough 46 (92) 48 (96) 0.40
  Fever (self-reported or measured) 39 (78) 34 (68) 0.26
  Coryza 39 (78) 28 (56) 0.019
  Fatigue 28 (56) 30 (60) 0.68
  Sore throat 27 (54) 31 (62) 0.42
  Headache 21 (42) 28 (56) 0.16
  Myalgia 19 (38) 23 (46) 0.42
  Dyspnea 12 (24) 10 (20) 0.63
  Vomiting 5 (10) 4 (8) 0.73
  Diarrhea
3 (6)
7 (14)
0.18
Severity of illness
  Limited activities 19 (38) 29‡ (58) 0.011
  Antiinfluenza treatment 12 (24) 19§ (42) 0.06

*Patient median age 25.8 years (range 3–53 years); 20 male and 30 female; median duration of illness 5.0 days (range 0–17 days).
†Patient median age 32.4 years (range 3–82 years); 25 male and 25 female; median duration of illness 7.0 days (range 1–35 days). Duration data from 45 reinterviewed case-patients. Excludes 5 case-patients for whom symptom data was collected at the time of testing but for whom laboratory results confirming influenza subtype H3N2 were not available at the time of reinterview.
‡Data from 45 reinterviewed case-patients. Excludes 5 case-patients for whom symptom data was collected at the time of testing but for whom laboratory results confirming influenza subtype H3N2 were not available at the time of reinterview.
§Treatment given with 48 hours of symptom onset.

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