[1] Univ Ghent, Fac Vet Med, Dept Pathol Bacteriol & Avian Dis, Salisburylaan 133, B-9820 Merelbeke, Belgium
[2] Univ Calgary, Calgary Lab Serv, 3330 Hosp Dr Northwest, Calgary, AB T2N 4N1, Canada
[3] Univ Calgary, Cummings Sch Med, 3330 Hosp Dr Northwest, Calgary, AB T2N 4N1, Canada
[4] Marine Mammal Ctr, 2000 Bunker Rd, Sausalito, CA 94965 USA