Open Access
Original contribution
Issue
Parasite
Volume 19, Number 2, May 2012
Page(s) 129 - 135
DOI http://dx.doi.org/10.1051/parasite/2012192129
Published online 15 May 2012

© PRINCEPS Editions, Paris, 2012

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This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.