[1] Inst Anim Hlth, Dept Vector Borne Dis, Woking GU24 0NF, Surrey, England
[2] Univ San Martin Porres, Sch Med, Res Inst, Lima, Peru
[3] Univ San Martin Porres, Sch Med, Inst Genet & Mol Biol, Lima, Peru
[4] Clemson Univ, Clemson, SC 29634 USA
[5] CSIRO, Australian Anim Hlth Lab, Geelong, Vic, Australia
[6] Berrimah Vet Labs, No Terr Dept Primary Ind Fisheries & Mines, Berrimah, NT 0801, Australia
[7] Colorado State Univ, Coll Vet Med & Biomed Sci, Dept Microbiol Immunol & Pathol, Ft Collins, CO 80523 USA
[8] Univ Texas Med Branch, Dept Pathol, Galveston, TX 77555 USA