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Microbial contamination of water-soaked cotton gauze and its cause
Abstract:
Seven in-use cotton gauze samples and three cotton balls soaked in sterile distilled water in canisters were investigated 7 days after they were prepared in hospital. All samples were contaminated with bacteria including 10(6) to 10(7) colony forming units/ml of Pseudomonas aeruginosa. In vitro viability tests using cotton gauze and cotton balls soaked in sterile distilled water revealed rapid proliferation of P. aeruginosa, Serratia marcescens and Candida albicans. Since the cotton gauze and the cotton balls were soaked in water containing nutrients, such as protein and glucose, these materials may be readily contaminated with bacteria including P. aeruginosa. Thus, when using cotton gauze and cotton balls containing water, microbial contamination should be expected.
Insights
Hospital-prepared cotton gauze and cotton balls soaked in water can rapidly grow bacteria like Pseudomonas aeruginosa. These materials, when wet, pose a significant risk of microbial contamination.
Area of Science:
- Microbiology
- Hospital Infection Control
- Medical Materials Science
Background:
- Cotton gauze and cotton balls are common medical supplies used in hospitals.
- Sterile distilled water is often used to prepare or moisten these materials for various applications.
- Potential for microbial contamination in hospital settings is a persistent concern.
Purpose of the Study:
- To investigate the microbial viability and proliferation in hospital-prepared cotton gauze and cotton balls soaked in sterile distilled water.
- To identify specific microorganisms that can contaminate these commonly used medical materials.
- To assess the risk of microbial contamination associated with wet cotton-based medical supplies.
Main Methods:
- Seven in-use cotton gauze samples and three cotton balls were collected from a hospital setting.
- Samples were soaked in sterile distilled water and stored in canisters for 7 days.
- In vitro viability tests were performed to assess microbial growth, including identification of specific bacterial and fungal species.
Main Results:
- All investigated samples were contaminated with high levels of Pseudomonas aeruginosa (10^6 to 10^7 CFU/ml).
- Rapid proliferation of P. aeruginosa, Serratia marcescens, and Candida albicans was observed in vitro.
- The presence of nutrients (protein, glucose) in the water used to soak the cotton materials facilitated bacterial growth.
Conclusions:
- Cotton gauze and cotton balls soaked in water, even sterile distilled water, are prone to significant microbial contamination.
- These materials can support the rapid growth of pathogenic microorganisms, including Pseudomonas aeruginosa.
- Healthcare professionals should anticipate and manage microbial contamination risks when using wet cotton-based supplies.