Cefazolin Inoculum Effect: How this test could improve care for MSSA bloodstream infections
Official title: Clinical Impact of the Cefazolin Inoculum Effect
Funded at Methodist Hospital Research Institute · NIH-11552820 · Data updated 2026-11-12
This project tests a quick lab test to find a specific cefazolin resistance pattern in MSSA blood infections so doctors can choose safer, more effective treatment.
Quick facts
| Grant type | R01 grant |
|---|---|
| Study type | NIH-funded research |
| Funding institution | Methodist Hospital Research Institute NIH-funded |
| Lab location | 1 site (Houston, United States) |
| Project start | June 1, 2025 |
| Project end | May 31, 2028 |
| Funding year | 2026 |
| Award (this year) | $54,000 |
| NIH project number | 3R01AI173138-04S1 |
| Project ID | NIH-11552820 on NIH RePORTER |
Who could benefit from this research
✓Could help
Patients with confirmed MSSA bacteremia who are treated with cefazolin may be eligible.
✕Less likely to help
Patients without MSSA bacteremia or those not treated with cefazolin may not benefit.
What this research studies
If MSSA bacteremia is treated with cefazolin, some bacteria may show the cefazolin inoculum effect (CzIE), which could lead to worse outcomes. The team developed a rapid nitrocefin-based color test to detect CzIE within hours, aiming to make it feasible for everyday clinical labs. They will study whether CzIE presence relates to poorer patient outcomes and whether rapid CzIE detection can guide better antimicrobial choices. The work involves international collaboration and will be conducted at Methodist Hospital Research Institute and partner sites to assess real-world impact.
Why it matters
Potential benefit: If successful, patients with MSSA bacteremia could receive more effective antibiotics sooner, potentially reducing complications and hospital stays.
How similar studies have gone: Prior findings suggest CzIE is clinically relevant, but the rapid test and its impact in routine care are being tested in this study.
Where this research is happening
-
Methodist Hospital Research Institute
Houston, United States Active
Researchers
- Principal investigator: Arias, Cesar Augusto — Methodist Hospital Research Institute
- Study coordinator: Arias, Cesar Augusto
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About this research
- This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
- Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
- For full project details, budget, and progress reports, visit the official NIH RePORTER page.