Acknowledgements
The authors thank the veterinary practitioners for contributing to this study,the AFVAC (Association Française des Animaux de Compagnie) and the SNVEL of region Ile de France for their help. We are also grateful to Dr Meriadeg Le Gouil and Pr Astrid Vabret for helpful discussions. We thank Damien Hoinard for the technical support provided for the serological analysis.