Abstract
A tissue culture-adapted strain of bovine rotavirus, grown in calf kidney monolayers, has been examined by light and electron microscopy after immunoperoxidase labelling. Some of the characteristic problems associated with pre-embedding methods have been demonstrated. Preparative techniques involving pretreatment of infected cells with a detergent followed by a detergent/fixative combination have enabled virus antigen to be labelled while maintaining satisfactory ultrastructural preservation.