Plasmids and hospital acquired infections

Area of Science:

• Microbiology
• Molecular Biology
• Epidemiology

Background:

• Multiply resistant gram-negative bacilli pose a significant threat in healthcare settings.
• Understanding resistance transfer mechanisms is crucial for infection control.

Purpose of the Study:

• To investigate the plasmid carriage and resistance transfer capabilities of multiply resistant gram-negative bacilli.
• To assess the potential of plasmids as epidemiological markers for hospital-acquired infections.

Main Methods:

• Isolation and characterization of 100 multiply resistant gram-negative bacilli strains.
• Conjugation experiments to transfer resistance patterns to a sensitive Escherichia coli recipient.
• Plasmid DNA analysis to confirm transfer and identify carried plasmids.

Main Results:

• Sixty-six percent (66) of the isolates successfully transferred their resistance patterns, or part thereof.
• Plasmids were successfully isolated from 40 of the resistant strains, correlating with resistance transfer.
• The study identified specific plasmids responsible for mediating multidrug resistance transfer.

Conclusions:

• Plasmids play a significant role in the dissemination of multidrug resistance among gram-negative bacilli.
• Plasmid profiling provides valuable epidemiological data for controlling hospital-acquired infections.
• Routine surveillance for plasmid-mediated resistance is essential for effective antimicrobial stewardship.