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A bovine herpesvirus (BHV-4) as passenger virus in ethmoidal tumours in Indian cattle.

A herpesvirus was isolated from tumours of the ethmoidal mucosa in two of three head of cattle in the State of Kerala, India. The virus designated M40 was cytopathic for a variety of cultured bovine and porcine cells and it did not kill suckling mice or chicken embryos. Sera from tumour-bearing cattle and goats reacted with the M40 virus. Immunofluorescence tests with FITC-conjugated IgG from a bovine monospecific antiserum to bovine herpesvirus 4 (BHV-4) stained the M40 virus specific antigen in infected cells. Experimental infection of goats with the M40 virus did not result in development of tumours. This virus is therefore considered to represent a "passenger" virus. A great similarity was found between restriction patterns of DNAs extracted from M40 virus and the strain 66-P-347, a reference strain of the BHV-4 group.