Volume 29, Number 6—June 2023
Research
Increased Incidence of Legionellosis after Improved Diagnostic Methods, New Zealand, 2000–2020
Frances F. Graham
, David Harte, Jane Zhang, Caroline Fyfe, and Michael.G. Baker
, David Harte, Jane Zhang, Caroline Fyfe, and Michael.G. Baker
Table 2
Increased incidence of legionellosis after improved diagnostic methods, showing risk factors associated with notified case-patients who had legionellosis and percentages reporting exposure, New Zealand, 2000–2020*
| Risk factor |
No. (%) cases |
Odds ratio (95% CI), 2010–2020 compared with 2000–2009 |
|
| 2000–2009 |
2010–2020 |
||
| Hospital-acquired | 2 (0.3) | 6 (0.2) | 0.8 (0.2–3.8) |
| Overseas travel during incubation period | 43 (6.7) | 112 (4.4) | 0.65 (0.45–0.93) |
| Contact with definite or suspected environmental source | 307 (47.5) | 1,437 (56.4) | 1.43 (1.09–1.3) |
| Compost source contact | ID | 1,054 (41.4) | ID |
| Water source contact | ID | 91 (3.6) | ID |
| Smoker or ex-smoker | 120 (18.6) | 326 (12.8) | 0.64 (0.51–0.81) |
| Preexisting immunocompromised or debilitating condition |
174 (26.9) |
666 (26.1) |
0.97 (0.79–1.27) |
| Total | 646 (100.0) | 2,547 (100.0) | NA |
*Percentages refer to notified case-patients who answered yes for the total number of notified cases for which a response was recorded. Some notified case-patients had >1 risk factor recorded. ID, incomplete data (no comparison could be made); NA, not applicable.
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Page updated: May 17, 2023
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