Summary of Awards to Date

Aerosol and Airborne transmission of Listeria Monocytogenes: A potential source of cross contamination.

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Aug. 15, 2006 - Aug. 14, 2009

Award Number


Funding Agency

Center for Produce Safety

Amount Awarded



James S. Dickson, Ph.D.
Iowa State University


Zimmerman, J. J.; Bryden, K. M.; Hoff, S. J.


It is widely assumed that Listeria monocytogenes can be transmitted to processed foods by means or airborne or aerosol transmission. "Airborne" bacteria may best be defined as bacteria which are attached to dust particles, while "aerosolized" bacteria may be defined as bacteria which are suspended in liquid, which then become airborne by physical actions which develop droplets. However, there is very little scientific data to support this assumption, or to provide the food industry with reliable information to help control airborne or aerosol transmission. This project will determine the optimum methods of recovery of airborne Listeria monocytogenes, and determine the effects of stress on the survival of airborne bacteria.