Volume 16, Number 11—November 2010
Research
Outbreaks of Pandemic (H1N1) 2009 and Seasonal Influenza A (H3N2) on Cruise Ship
, Jenna M. Iwasenko, and Dominic E. Dwyer
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.