Table 2.
Symptoms of Legionnaires' disease and Pontiac fever cases
| Symptom | No. (%) of Legionnaires' disease cases | No. (%) of Pontiac fever cases | RR (95% CI) of symptom, Legionnaires' disease vs. Pontiac fever |
|---|---|---|---|
| Fever | 29 (100) | 38 (100) | 1·0 |
| Headache | 27 (93) | 34 (89) | 1·0 (0·9–1·2) |
| Shortness of breath | 26 (90) | 21 (55) | 1·6 (1·2–2·2) |
| Cough | 24 (83) | 26 (68) | 1·2 (0·9–1·6) |
| Muscle aches | 23 (82) | 30 (79) | 1·0 (0·8–1·3) |
| Chest discomfort | 22 (79) | 21 (55) | 1·4 (1·0–2·0) |
| Abdominal pain | 17 (61) | 12 (32) | 1·9 (1·1–3·3) |
| Diarrhoea | 15 (54) | 15 (39) | 1·4 (0·8–2·3) |
| Vomiting | 11 (38) | 10 (26) | 1·4 (0·7–2·8) |
| Disorientation | 10 (36) | 10 (26) | 1·4 (0·7–2·8) |
RR, Relative risk; CI, confidence interval.