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Submitted on: 27 December 2012.
Revised on: 15 February 2013.
Accepted on: 10 March 2013.
___________________European Journal of Microbiology and Immunology
Submitted on: 24 April 2012.
Revised on: 26 May 2012.
Accepted on: 07 July 2012.
___________________European Journal of Microbiology and Immunology
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