U.S. Legionnaires’ Disease Outbreak Trends by Year
This tracker currently catalogs 109 Legionnaires’ disease outbreaks spanning 2007–2026, totaling 1,411 reported cases and 109 deaths. The chart shows how many distinct outbreaks are recorded per year. Figures are provisional and reflect what has been catalogued here — not total U.S. incidence, which the CDC reports separately.
By the numbers
| Year | Outbreaks | Cases | Deaths |
|---|---|---|---|
| 2026 | 77 | 853 | 71 |
| 2025 | 0 | 0 | 0 |
| 2024 | 4 | 21 | 0 |
| 2023 | 0 | 0 | 0 |
| 2022 | 0 | 0 | 0 |
| 2021 | 3 | 104 | 2 |
| 2020 | 0 | 0 | 0 |
| 2019 | 2 | 127 | 1 |
| 2018 | 2 | 8 | 0 |
| 2017 | 0 | 0 | 0 |
| 2016 | 7 | 41 | 2 |
| 2015 | 4 | 142 | 24 |
| 2014 | 2 | 5 | 0 |
| 2013 | 6 | 98 | 8 |
| 2012 | 0 | 0 | 0 |
| 2011 | 1 | 11 | 0 |
| 2010 | 0 | 0 | 0 |
| 2009 | 0 | 0 | 0 |
| 2008 | 0 | 0 | 0 |
| 2007 | 1 | 1 | 1 |
Source: outbreaks catalogued by this tracker from CDC NNDSS, health-department releases, news reports, and Pritzker Hageman’s published outbreak reporting. Provisional — a year’s totals can change as outbreaks are added or figures are revised.
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