Twenty-four Belgian field isolates of bovine herpesvirus 4 (BHV-4), together with four reference strains were compared by radio-immunoprecipitation and western blotting using a polyvalent antiserum and monoclonal antibodies raised against major glycoproteins. Most of these strains showed the same protein profile as the European reference strain Movar 33/63. For two strains the molecular weight of gp 6, p (gp 10/gp 17) and gp 10 were the same as those of the American reference strain DN 599. No relationship could be established between the protein profiles and origin of the isolates or with the restriction patterns. This study provides a view of the molecular weight variations of the major BHV-4 glycoproteins among field isolates.
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