Table 3. Clinical features for pandemic (H1N1) 2009 case-patients and household contacts, Victoria, Australia, May 18–June 3, 2009.
| Feature | No. (%) index case-patients, n = 36 | No. (%) secondary case-patients, n = 18 | p value* |
|---|---|---|---|
| Sign or symptom | |||
| Fever | 35 (97.2) | 18 (100) | 0.67 |
| Chills | 17 (47.2) | 8 (44.4) | 0.54 |
| Headache | 25 (69.4) | 13 (72.2) | 0.55 |
| Muscle pain | 20 (55.6) | 8 (44.4) | 0.32 |
| Joint pain | 15 (41.7) | 7 (38.9) | 0.54 |
| Fatigue | 30 (83.3) | 16 (88.9) | 0.46 |
| Diarrhea | 8 (22.2) | 2 (11.1) | 0.28 |
| Vomiting | 16 (44.4) | 2 (11.1) | 0.01 |
| Upper respiratory tract symptoms |
32 (88.9) |
17 (94.4) |
0.45 |
| Sign or symptom duration, d | |||
| 1–3 | 9 (25.0) | 2 (11.2) | 0.49 |
| 4–6 | 13 (36.1) | 9 (50.0) | |
| 7–9 | 9 (25.1) | 3 (16.7) | |
|
>10 |
5 (13.8) |
4 (22.2) |
|
| Any medical care received |
36 (100) |
14 (77.8) |
0.01 |
| Reported prevention and control measures taken | |||
| Quarantine | 32 (88.9) | 15 (83.3) | 0.43 |
| Antiviral prophylaxis | 0 | 1 (5.56) | 0.43 |
| Antiviral treatment | 11 (33.3) | 2 (11.1) | 0.10 |
*Fisher exact test statistic used when expected value was <6.