Related Experiment Video
Updated: Oct 20, 2026
Cell Culture Techniques and Practices to Avoid Contamination by Fungi and Bacteria in the Research Cell Culture Laboratory
Published on: July 7, 2023
Bacterial contamination in a modern operating suite. 3. Importance of floor contamination as a source of airborne
Abstract:
The redispersal factor for bacteria-carrying particles from a contaminated floor was determined after mopping, blowing and walking activity. Walking gave the highest redispersal factor, 3.5 X 10(-3) m-1, which was three times higher than for blowing and 17 times higher than for mopping. The mean die-away rate for the bacteria-carrying particles used was 1.9/h without ventilation and 14.3/h with ventilation. It was calculated that in the operating rooms less than 15% of the bacteria found in the air were redispersed floor bacteria.
Insights
Walking activity significantly increases bacteria redispersal from floors. Ventilation greatly enhances the die-away rate of airborne bacteria, reducing contamination in operating rooms.
Area of Science:
- Environmental microbiology
- Infection control
Background:
- Bacterial contamination of floors can lead to airborne particle redispersal.
- Understanding particle movement is crucial for maintaining sterile environments.
Purpose of the Study:
- To quantify the redispersal factor of bacteria-carrying particles from floors due to different activities.
- To determine the die-away rates of airborne bacteria with and without ventilation.
Main Methods:
- Determined redispersal factors for bacteria-carrying particles after mopping, blowing, and walking.
- Measured mean die-away rates of airborne bacteria under ventilated and non-ventilated conditions.
Main Results:
- Walking activity yielded the highest redispersal factor (3.5 x 10^-3 m^-1), significantly exceeding blowing and mopping.
- The mean die-away rate was 1.9/h without ventilation and 14.3/h with ventilation.
- Airborne bacteria in operating rooms were found to be less than 15% redispersed floor bacteria.
Conclusions:
- Walking is the most significant activity for bacterial redispersal from contaminated floors.
- Ventilation is highly effective in reducing airborne bacterial load.
- Redispersed floor bacteria contribute minimally to the overall airborne bacterial count in operating rooms.
More Related Videos
Related Concept Videos
01:20Infection
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
01:22Healthcare Associated Infections II: Preventive Measures
The best practices for preventing healthcare-associated infections include hand hygiene, patient risk...
01:30Cleaning, Sterilization, and Disinfection
Cleaning
The cleaning process usually involves using water with detergents or enzymatic cleaner and removing foreign material from objects and surfaces, including organic material such as body fluids or inorganic material like soil. Cleaning is performed before high-level disinfection and sterilization because foreign materials on the cover of the devices interfere with process...
01:25Transmission-based Precautions II: Airborne and Protective Environment
Airborne precautions:
Use airborne precautions when treating patients known or suspected to have diseases that spread through the air—for example, tuberculosis or measles. These organisms are present in smaller droplets expelled by an infected person and...
01:26Standard Precaution
Hand hygiene is the most crucial means to prevent the transmission of disease. Employers are legally required to provide their workers with personal protective equipment (PPE) to minimize exposure or contact with...
01:29Sources of Food Contamination