[1] USDA, Parisite Biol Epidemiol & Systemat Lab, Beltsville Agr Res Ctr, Anim & Nat Resources Inst,Agr Res Serv, Beltsville, MD 20705 USA
[2] Univ Calif Davis, Sch Vet Sci, Davis, CA 95617 USA
[3] Univ Guelph, Ontario Vet Coll, Dept Pathobiol, Guelph, ON N1G 2W1, Canada
[4] Norwegian Sch Vet Sci, Dept Morphol Genet & Aquat Biol, N-0033 Oslo, Norway
[5] Swedish Univ Agr Sci, Dept Ruminant Med & Vet Epidemiol, SE-75007 Uppsala, Sweden
[6] Cornell Univ, Coll Vet Med, Dept Microbiol & Immunol, Ithaca, NY 14853 USA
[7] Auburn Univ, Coll Vet Med, Dept Pathobiol, Auburn, AL 36849 USA
[8] Moredun Res Inst, Int Res Ctr, Edinburgh EH26 0PZ, Midlothian, Scotland
[9] Univ Technol Sydney, Dept Cell & Mol Biol, Sydney, NSW 2065, Australia
[10] Univ Bern, Inst Parasitol, CH-3012 Bern, Switzerland
[11] Univ Kentucky, Gluck Equine Res Ctr, Lexington, KY 40546 USA
[12] Obihiro Univ Agr & Vet Med, Dept Vet Pathol, Obihiro, Hokkaido 0808555, Japan
[13] Univ Vet & Pharmaceut Sci, Dept Parasitol, Brno, Czech Republic
[14] Acad Sci Czech Republ, Inst Parasitol, CR-37005 Ceske Budejovice, Czech Republic
[15] Univ Missouri, Dept Vet Pathobiol, Columbia, MO 65211 USA
[16] Natl Vet Inst, Dept Parasitol, SWEPAR, SE-75189 Uppsala, Sweden
[17] Swedish Univ Agr Sci, SE-75189 Uppsala, Sweden
[18] Univ Illinois, Dept Vet Pathobiol, Urbana, IL 61802 USA
[19] Obihiro Univ Agr & Vet Med, Dept Vet Physiol, Obihiro, Hokkaido 0808555, Japan
[20] Washington Univ, Sch Med, Dept Mol Microbiol, St Louis, MO 63110 USA
[21] Univ Tennessee, Coll Agr Sci & Nat Resources, Knoxville, TN 37996 USA
[22] Univ Tennessee, Tennessee Agr Expt Stn, Knoxville, TN 37996 USA
[23] Univ Liverpool Liverpool Sch Trop Med, Liverpool L3 5QA, Merseyside, England
[24] Kansas State Univ, Div Biol, Manhattan, KS 66506 USA
[25] Virginia Tech, Virginia Maryland Reg Coll Vet Med, Dept Biomed Sci & Pathobiol, Ctr Mol Med & Infect Dis, Blacksburg, VA 24061 USA