[1] Univ Autonoma Barcelona, Fac Vet, Dept Sanitat & Anat Anim, E-08193 Barcelona, Spain
[2] Univ Autonoma Barcelona, Fac Vet, Serv Ecopatol Fauna Salvatge, E-08193 Barcelona, Spain
[3] Univ St Andrews, Scottish Oceans Inst, Sea Mammal Res Unit, St Andrews, Fife, Scotland
[4] Univ La Rochelle, Littoral Environm Soc, F-17000 La Rochelle, France
[5] UCO, Fac Vet, Dept Sanidad Anim, Cordoba 14071, Spain
[6] ARS, Anim Parasit Dis Lab, Anim & Nat Resources Inst, USDA, Beltsville, MD 20705 USA
[7] UAB IRTA, CReSA, Barcelona 08193, Spain