Volume 10, Number 7—July 2004
Research
Q Fever Outbreak in Industrial Setting
Hugo C. van Woerden*
, Brendan W. Mason*, Lika K. Nehaul†, Robert Smith*, Roland L. Salmon*, Brendan Healy‡, Manoj Valappil§, Diana Westmoreland§, Sarah de Martin†, Meirion R. Evans*, Graham Lloyd¶, Marysia Hamilton-Kirkwood‡, and Nina S. Williams*
, Brendan W. Mason*, Lika K. Nehaul†, Robert Smith*, Roland L. Salmon*, Brendan Healy‡, Manoj Valappil§, Diana Westmoreland§, Sarah de Martin†, Meirion R. Evans*, Graham Lloyd¶, Marysia Hamilton-Kirkwood‡, and Nina S. Williams*Table 2
Attack rates and odds ratios for different areas of work at factory implicated in Q fever outbreak, Newport, Wales, August–September 2002
| Category | No. of persons working in area |
No. of persons working elsewhere |
OR (95% CI) | ||||
|---|---|---|---|---|---|---|---|
| Cases | Controls | Attack rate (%) | Cases | Controls | Attack rate (%) | ||
| Production/factory floor |
35 |
52 |
40.2 |
26 |
29 |
47.3 |
0.78 (0.36–1.57) |
| Dispatch |
0 |
1 |
0 |
61 |
80 |
43.3 |
0 (0–71.79) |
| Dispatch/factory floor |
4 |
4 |
50.0 |
57 |
77 |
42.5 |
0.68 (0.14–2.68) |
| Office |
20 |
10 |
66.7 |
41 |
71 |
36.6 |
3.46 (1.38–9.06) |
| Production-based but sometimes in the office |
1 |
2 |
33.3 |
60 |
79 |
43.2 |
0.66 (0.01–12.96) |
| Design |
0 |
7 |
0 |
61 |
74 |
45.2 |
0 (0–0.88) |
| Sales representatives |
0 |
5 |
0 |
61 |
76 |
44.5 |
0 (0–1.42) |
| Dispatch but sometimes in the office |
1 |
0 |
100 |
60 |
81 |
42.6 |
Undefined |
| Total | 61 | 81 | 43.0 | ||||
aOR, odds ratio; CI, confidence interval.
