Muurling F, Helder A W, Roest G, Kroll O
Tijdschr Diergeneeskd. 1976 Nov 15;101(22):1263-4.
The appearance of IBR among cattle in the environs of Leyden is reported. Possible explanations of local differences in the incidence of IBR and possible effects on IBR immunisation of cattle in these areas are referred to in the discussion.