Volume 32, Number 3—March 2026
Synopsis
Stenotrophomonas maltophilia Bloodstream Infection Outbreak in Acute Care Hospital, California, USA, 2022–20231
Sana M. Khan, Axel A. Vazquez Deida, Steven Langerman, Jennifer C. Hunter, Rebeca Elliott, Alison Laufer Halpin, Alyssa G. Kent, Paige Gable, Heather A. Moulton-Meissner, Frances C. Knight, Thomas Ewing, Kristen Clancy, Amit Chitnis, Eileen F. Dunne, Dustin Heaton, Barbara Allen, Hillary Metcalf, Munira Shemsu, Kathleen Nava, Suada Abdic, Kiran M. Perkins, Elsa Villarino, Jeffrey Silvers, and Kavita K. Trivedi
Table 1
Characteristics of case-patients and control patients in a Stenotrophomonas maltophilia bloodstream infection outbreak in acute care hospital, California, USA, 2022–2023*
| Characteristics | No. (%) case-patients, n = 13 | No. (%) control-patients, n = 39 |
|---|---|---|
| Median age, y (IQR) |
45 (36.0–68.0) |
64.0 (60.0–75.0) |
| Sex | ||
| M | 9 (69.2) | 27 (69.2) |
| F |
4 (30.8) |
12 (30.8) |
| Race | ||
| White | 5 (46.2) | 14 (35.9) |
| Black/African American | 2 (15.4) | 9 (23.1) |
| Asian | 1 (7.7) | 8 (20.5) |
| American Indian/Alaska Native | 1 (7.7) | 0 |
| Native Hawaiian or other Pacific Islander | 0 | 2 (5.1) |
| Other |
4 (23.1) |
6 (15.4) |
| Ethnicity | ||
| Hispanic | 3 (23.0) | 8 (22.2) |
| Non-Hispanic |
10 (77.0) |
28 (77.8) |
| No. underlying conditions† | ||
| 0 | 6 (46.2) | 9 (23.1) |
| 1 | 6 (46.2) | 13 (33.3) |
| 2 | 1 (7.7) | 10 (25.6) |
| 3 | 0 | 4 (10.3) |
| 4 |
0 |
3 (7.7) |
| Admitted to ICU from ED | 12 (92.3) | 36 (92.3) |
| Critical care bay of ED |
10 (76.9) |
26 (66.7) |
| On immunosuppressant treatments | 1 (7.7) | 3 (7.7) |
| Median no. (IQR) days between admission and positive culture collection | 5 (3–10) | NA |
*ED, emergency department; ICU, intensive care unit; NA, not applicable. †Underlying conditions were assessed by using electronic health records and included coronary artery disease, congestive heart failure, diabetes, peripheral vascular disease, gastrointestinal disease, liver disease, chronic kidney disease, obesity, cancer, and hypertension.
1Preliminary results were presented at the Society for Healthcare Epidemiology of America Spring Conference; April 16–19, 2024; Houston, Texas, USA.
Page created: February 06, 2026
Page updated: March 20, 2026
Page reviewed: March 20, 2026
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