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Applied and Environmental Microbiology, May 2007, p. 3423-3427, Vol. 73, No. 10
0099-2240/07/$08.00+0     doi:10.1128/AEM.00047-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Coccoid Form of Helicobacter pylori as a Morphological Manifestation of Cell Adaptation to the Environment{triangledown} ,{dagger}

N. F. Azevedo,1,2* C. Almeida,1 L. Cerqueira,1 S. Dias,3 C. W. Keevil,2 and M. J. Vieira1

Centro de Engenharia Biológica, Universidade do Minho, 4700-057 Braga, Portugal,1 Environmental Healthcare Unit, School of Biological Sciences, University of Southampton, Southampton, United Kingdom,2 Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Viana do Castelo, Viana do Castelo, Portugal3

Received 9 January 2007/ Accepted 18 March 2007

After characterization of preferred conditions for Helicobacter pylori survival in the sessile state, it was observed that the bacterium transforms from spiral to coccoid under mild circumstances, whereas under extreme ones it is unable to undergo shape modification. This strongly supports the view that transformation into the coccoid form is an active, biologically led process, switched on by the bacterium as a protection mechanism.

* Corresponding author. Mailing address: Centro de Engenharia Biológica, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal. Phone: 351 917775507. E-mail: nunoazevedo{at}deb.uminho.pt

{triangledown} Published ahead of print on 30 March 2007.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, May 2007, p. 3423-3427, Vol. 73, No. 10
0099-2240/07/$08.00+0     doi:10.1128/AEM.00047-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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