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Applied and Environmental Microbiology, November 2005, p. 7571-7574, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7571-7574.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Factors Influencing the Ability of Listeria monocytogenes To Pass through a Membrane Filter by Active Infiltration

Kentaro Nakazawa,1 Hiroyuki Hasegawa,1 Yoji Nakagawa,1 Michinori Terao,2 and Tohey Matsuyama3*

Department of Applied Biological Chemistry, Faculty of Agriculture, Niigata University, Niigata 950-2181,1 Department of Medical Technology, Faculty of Medicine, Niigata University, Niigata 951-8518,2 Department of Infectious Disease Control and International Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan3

Received 18 February 2005/ Accepted 30 June 2005

Listeria monocytogenes infiltrated the reticulate structure of a membrane filter and passed through a filter with pore sizes of 0.45 µm and 0.2 µm in 6 to 24 h and 5 to 6 days, respectively. Flagellar motility and expansive pressure generated by the growing bacterial population were indicated as the driving forces of infiltration.

* Corresponding author. Mailing address: Department of Infectious Disease Control and International Medicine, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan. Phone: 81 25 227 2111. Fax: 81 25 262 6360. E-mail: tohey{at}med.niigata-u.ac.jp.

Applied and Environmental Microbiology, November 2005, p. 7571-7574, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7571-7574.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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