In a colony of 11 harbour seals ( Phoca vitulina Linne ́ 1758) two periods of lethal central nervous disorders occurred within two years affecting seven adult animals. Clinical signs comprised dyspnoea, anorexia, apathy, incoordination, and lateral recumbency. Grossly, in two animals a swollen cerebellum with haemorrhages was present. Histological examination in all seven cases revealed a polioe...
