Volume 11, Number 3—March 2005
Probable Psittacosis Outbreak Linked to Wild Birds
|Potential risk factors for psittacosis||Adjusted* OR (95% CI)†||p value|
|Age group (y)|
|Resident of the upper Blue Mountains||15.2 (5.6–41.7)||<0.0001|
|History of asthma||0.1 (0.01-0.8)||0.03|
|Level of contact with free-ranging (wild) birds|
|Only indirect contact||2.6 (1.0–7.3)||0.06|
|Any direct contact||7.4 (2.5–22)||0.0003|
|Contact with caged or domestic birds||0.2 (0.04–0.8)||0.02|
|Did not mow lawn||Referent|
|Only mowed lawn with a grass catcher||0.4 (0.1–1.3)||0.12|
|Mowed lawn without a grass catcher||3.2 (1.3–8.0)||0.01|
|Potting or weeding||0.2 (0.1–0.5)||0.001|
*After adjustment for the effects of age group, sex, region of residence, outdoor employment, history of asthma, level of free-ranging (wild) bird contact, contact with caged or domestic birds, lawn mowing, potting or weeding, smoking history, general health self-rating, duration lived in the Blue Mountains, soft landscaping, hard landscaping, using compost, and residence adjacent to bushland.
†OR, odds ratio; CI, confidence interval.