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Aerosol droplets produced by flushing the toilet can mix with the air of the room, [8] larger droplets will settle on surfaces or objects creating fomites (infectious pools) before they can dry, like on a counter top or toothbrush; [7] [10] and can contaminate surfaces such as the toilet seat and handle for hours, which can then be contacted by hands of the next user of that toilet. [3]
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Non-motile bacteria cannot recognize surfaces or aggregate together as easily as motile bacteria. [21] During surface colonization bacteria cells are able to communicate using quorum sensing (QS) products such as N-acyl homoserine lactone (AHL). Once colonization has begun, the biofilm grows by a combination of cell division and recruitment.
Antimicrobial copper-alloy touch surfaces can prevent frequently touched surfaces from serving as reservoirs for the spread of pathogenic microbes. This is especially true in healthcare facilities, where harmful viruses, bacteria, and fungi colonize and persist on doorknobs, push plates, handrails, tray tables, tap (faucet) handles, IV poles, HVAC systems, and other equipment. [1]
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The surfaces used were carpet, ceramic tile, stainless steel and wood. The food was left on the surface for intervals of 5, 30 and 300 seconds. The scientists assessed the amount of E. aerogenes transferred between surface and food. Since bacteria tended to be attracted to moisture, wet food had more risk to have bacteria transferred than dry food.
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The material can affect the time bacteria can survive on door handles, but more important is the temperature and humidity of the environment. A hospitable environment can allow bacteria to thrive for anywhere from a few hours to a few weeks on a surface. A crucial factor in the bacterial growth and spread is the location of the handle.