Volume 30, Number 1—January 2024
Research
Incidence of Legionnaires’ Disease among Travelers Visiting Hotels in Germany, 2015–2019
Udo Buchholz
, Bonita Brodhun, and Ann-Sophie Lehfeld
, Bonita Brodhun, and Ann-Sophie Lehfeld
Table 2
Incidence rates for first, second, and third occurrences of Legionnaires’ disease among travelers visiting hotels in Germany, 2015–2019*
| Constellation | No. | TALD cases/1 million nights | IRR (95% CI) |
|---|---|---|---|
| First-case incidence rate† | |||
| No. nights in hotels in Germany during 2015−2019 | 1,351,540,219 | NA | NA |
| No. nights from first TALD case until end of 2019 | 24,568,957 | NA | NA |
| No. nights in hotels that did not have a TALD case or until occurrence of first case | 1,326,971,262 | NA | NA |
| No. hotels that had a first TALD case | 309 | NA | NA |
| First-case incidence |
NA |
0.23 |
Referent |
| Second-case incidence rate among hotels that had a first case | |||
| No. nights among hotels that had a first case before the end of 2019 or until the occurrence of a second case | 21,905,432 | NA | NA |
| No. hotels that had a second TALD case | 28 | NA | NA |
| Second-case incidence |
NA |
1.3 |
5.5 (3.6−7.9) |
| Third-case incidence rate among hotels that had a second case | |||
| No. nights among hotels that had a second case before the end of 2019 or until the occurrence of a third case | 1,274,759 | NA | NA |
| No. hotels that had a third TALD case | 12 | NA | NA |
| Third-case incidence |
NA |
9.4 |
40 (21−71) |
| Third-case incidence rate among cluster or reoffending hotels | |||
| No. nights among cluster hotels before the end of 2019 or until the occurrence of a third case >8 wk after cluster notification | 1,350,676 | NA | NA |
| No. reoffending hotels that had a third TALD case | 8 | NA | NA |
| Reoffender incidence | NA | 5.9 | 25 (11−50) |
*Data were reported by 29 countries (including Germany) to the European Legionnaires’ Disease Surveillance Network (https://www.ecdc.europa.eu/en/about-us/partnerships-and-networks/disease-and-laboratory-networks/eldsnet); numbers of nights are provided for travelers of those 29 countries. IRR, incidence rate ratio; NA, not applicable; TALD, travel-associated Legionnaires’ disease. †Baseline/referent incidence rate among all hotels.
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