NCT07475429

Impact of Siderophore Genes on Cefiderocol Susceptibility in Carbapenem Resistant Hypervirulent Klebsiella Pneumoniae

• Status: Not Yet Recruiting
• Phase: —
• Study type: Observational
• Enrollment: 100 (estimated)
• Sponsor: Sohag University · Academic / Other
• Sex: All
• Age: —
• Healthy volunteers: Accepted

Summary

1. Sample: Clinical specimens (blood, urine, sputum, wound swabs) will be collected aseptically and transported to the microbiology laboratory for analysis. 2. Culture: Specimens will be inoculated on MacConkey agar and incubated at 35-37°C for 18-24 hours. Colonies with typical K. pneumoniae morphology (mucoid, lactose-fermenting) will be selected for further testing 3. Identification of isolates will be done by: Colony morphology, Gram staining, and conventional biochemical tests (eg, indole, citrate utilization, urease, Voges-Proskauer) . 4. Antimicrobial susceptibility testing of the isolates : Antimicrobial susceptibility testing was performed and interpreted according to the Clinical and Laboratory Standards Institute (CLSI) guidelines, M100 document (latest edition)." 5. MIC determination for cifederecol using E-test . 6. Phenotypic Detection of hvKP: 1. String Test: A viscous string ≥5 mm formed by stretching a single colony indicates hypermucoviscosity . 2. Capsule Staining: to visualize large capsules . 3. Siderophore Production: Assessed on chrome azurol S (CAS) agar to detect iron-chelating activity. 7. Detection of siderophore genes by Simple qualitative PCR .

Detailed description

Klebsiella pneumoniae ( K.pneumoniae ) is a Gram-negative, encapsulated, non-motile bacterium of the Enterobacteriaceae family and a major pathogen responsible for a broad spectrum of healthcare- and community-acquired infections, including pneumonia, urinary tract infections, bloodstream infections, and pyogenic liver abscesses 1. Sample: Clinical specimens (blood, urine, sputum, wound swabs) will be collected aseptically and transported to the microbiology laboratory for analysis. 2. Culture: Specimens will be inoculated on MacConkey agar and incubated at 35-37°C for 18-24 hours. Colonies with typical K. pneumoniae morphology (mucoid, lactose-fermenting) will be selected for further testing 3. Identification of isolates will be done by: Colony morphology, Gram staining, and conventional biochemical tests (eg, indole, citrate utilization, urease, Voges-Proskauer) . 4. Antimicrobial susceptibility testing of the isolates : Antimicrobial susceptibility testing was performed and interpreted according to the Clinical and Laboratory Standards Institute (CLSI) guidelines, M100 document (latest edition)." 5. MIC determination for cifederecol using E-test . 6. Phenotypic Detection of hvKP: 1. String Test: A viscous string ≥5 mm formed by stretching a single colony indicates hypermucoviscosity . 2. Capsule Staining: to visualize large capsules . 3. Siderophore Production: Assessed on chrome azurol S (CAS) agar to detect iron-chelating activity. 7. Detection of siderophore genes by Simple qualitative PCR .

Conditions

• Carbapenem-resistant Hypervirulent Klebsiella Pneumoniae Infection

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Cefiderocol susceptibility testing	Determination of cefiderocol susceptibility in carbapenem-resistant hypervirulent Klebsiella pneumoniae isolates using antimicrobial susceptibility testing according to CLSI guidelines.

Timeline

• Start date: 2026-03-15
• Primary completion: 2026-08-01
• Completion: 2026-10-01
• First posted: 2026-03-16
• Last updated: 2026-03-24

Locations

1 site across 1 country: Egypt