Bacterial colonization of Hemasite access devices

Area of Science:

• Microbiology
• Infectious Diseases
• Biomaterials Science

Background:

• Vascular access ports (Hemasites) are susceptible to becoming infection foci.
• Biofilm formation on medical devices is a significant clinical challenge.

Purpose of the Study:

• To investigate the microbial and morphological characteristics of biofilms on infected Hemasites.
• To understand the implications of biofilm presence for infection management and treatment.

Main Methods:

• Microbiologic culturing techniques were used to identify bacteria.
• Morphologic examination (microscopy) was employed to analyze biofilm structure.
• Hemasites recovered from infected patients were analyzed.

Main Results:

• All examined Hemasites exhibited well-developed biofilms on their extraluminal surfaces.
• Biofilms comprised host material, bacteria (e.g., Staphylococcus aureus, Streptococcus faecalis, Proteus mirabilis), and extracellular products.
• One Hemasite showed a polymicrobial biofilm with at least six distinct bacterial types.

Conclusions:

• Biofilm formation on Hemasites contributes to persistent infections.
• Bacteria within biofilms are protected from host defenses and antibiotic therapy.
• Complete removal of the infected device, including the biofilm, is essential for infection resolution.