Related Experiment Video
Updated: Jun 19, 2026

Quadruple-Checkerboard: A Modification of the Three-Dimensional Checkerboard for Studying Drug Combinations
Published on: July 24, 2021
Ceftazidime in Gram-negative infections: three case reports.
J K Wardle1, J B Selkon, H R Ingham
1Regional Public Health Laboratory, Newcastle General Hospital, Newcastle upon Tyne, England.
Ceftazidime combined with gentamicin effectively treated serious Gram-negative infections in three patients. This antibiotic combination led to clinical improvement and rapid bacterial clearance without adverse effects.
Area of Science:
- Infectious Diseases
- Pharmacology
- Critical Care Medicine
Background:
- Serious Gram-negative bacterial infections pose significant therapeutic challenges.
- Ceftazidime is a third-generation cephalosporin with broad-spectrum activity against Gram-negative bacilli.
- Combination antibiotic therapy is often employed for severe infections.
Observation:
- Three patients with severe Gram-negative infections were treated.
- Cases included Enterobacter cloacae meningitis, Pseudomonas aeruginosa mediastinitis, and Pseudomonas aeruginosa pneumonia.
- Treatment involved ceftazidime in conjunction with gentamicin.
Findings:
- Ceftazidime and gentamicin combination therapy resulted in clinical improvement in all three patients.
- Rapid clearance of Gram-negative bacilli from infected sites was observed.
- No significant hematological or biochemical abnormalities were attributed to ceftazidime.
Implications:
- Ceftazidime, when combined with gentamicin, demonstrates efficacy in treating severe Gram-negative infections.
- This combination therapy offers a viable treatment option for challenging infections like meningitis, mediastinitis, and pneumonia.
- The safety profile of ceftazidime in this context appears favorable, with no drug-related abnormalities detected.
Related Concept Videos
Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care
Inhibitors of Bacterial DNA Synthesis
Mechanism of Antibiotic Resistance in MRSA
Acute Pyelonephritis II: Diagnostic Studies and Management

