The isolation, serological classification and growth properties of adenoviruses isolated from fatal cases of haemorrhagic enterocolitis in calves are described. Four viruses, from different submissions, were isolated in cultures of calf testis cells and were identified as adenoviruses by electron microscopy. The four isolates were serologically identical and were classified as bovine adenovirus type 10 in cross-neutralisation tests with other bovine, ovine and porcine adenovirus species. Their growth in the nucleus of infected cells was accompanied by the production of typical adenovirus-associated inclusions. A serological survey to determine the incidence of infection with the virus in cattle in Northern Ireland demonstrated the presence of low levels of neutralising antibodies in 55 per cent of cattle over two years old, although only 8 per cent were positive at a 1/500 dilution of serum.
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