[1] Acad Sci Czech Republ, Inst Parasitol, CZ-37005 Ceske Budejovice, Czech Republic
[2] Univ Vet & Pharmaceut Sci, Dept Biol & Wildlife Dis, Fac Vet Hyg & Ecol, CZ-61242 Brno, Czech Republic
[3] Acad Sci Czech Republ, Inst Vertebrate Biol, Dept Aviat Ecol, CZ-60365 Brno, Czech Republic
[4] Univ Queensland, Vet Teaching Hosp, Sch Vet Sci & Anim Prod, St Lucia, Qld 4072, Australia