Volume 32, Number 2—February 2026
Dispatch
Desulfovibrio Bacteremia in Patients with Abdominal Infections, Japan, 2020–2025
Naoki Watanabe1
, Tomohisa Watari, and Yoshihito Otsuka
, Tomohisa Watari, and Yoshihito Otsuka
Table 2
Characteristics of Desulfovibrio isolates in patients with abdominal infections, Japan, 2020–2025*
| Case no. | Confirmed species (method) | MALDI-TOF MS primary result (score) | MIC, μg/mL |
β-lactamase genes detected | ||||
|---|---|---|---|---|---|---|---|---|
| SAM | TZP | FOX | CRO | MTZ | ||||
| 1 | D. legallii (WGS/ANI) | Uncertain (<2.0) | ≤0.5 | >64 | >32 | 4 | <0.5 | None |
| 2 | D. fairfieldensis (WGS/ANI) | D. fairfieldensis (2.4) | 16 | >64 | >32 | >32 | <0.5 | blaCfiA-like |
| 3 | D. falkowii (WGS/ANI) | Uncertain (<2.0) | <0.5 | 64 | >32 | 8 | <0.5 | None |
| 4 | D. fairfieldensis (WGS/ANI) | D. fairfieldensis (2.4) | 8 | >64 | >32 | >32 | <0.5 | blaCfiA-like |
| 5 | D. falkowii (WGS/ANI) | Uncertain (<2.0) | 4 | 64 | >32 | >32 | <0.5 | blaMUN-1 |
| 6 | D. desulfuricans (WGS/ANI) | D. desulfuricans (2.1) | 1 | 32 | >32 | 32 | <0.5 | blaDES-1-like |
| 7† | D. legallii (16S) | Uncertain (<2.0) | 1 | 64 | >32 | 8 | <0.5 | Not determined |
| 8 | D. desulfuricans (WGS/ANI) | D. desulfuricans (2.1) | 2 | 64 | >32 | >32 | <0.5 | blaDES-1-like |
*MICs were determined by broth microdilution in Brucella broth under anaerobic conditions. Resistance genes were identified in draft genomes by using AMRFinderPlus (https://github.com/ncbi/amr). ANI, average nucleotide identity; CRO, ceftriaxone; FOX, cefoxitin; MALDI-TOF MS, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry; MTZ, metronidazole; SAM, ampicillin/sulbactam; TZP, piperacillin/tazobactam; WGS, whole-genome sequencing. †For case 7, β-lactamase gene detection was not determined because the genome assembly did not meet completeness criteria.
Page created: January 20, 2026
Page updated: February 19, 2026
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