Abstract
The plaquing ability of two isolates of bovine enteric coronavirus (BECV) was studied in HRT18 (human rectal adenocarcinoma) cell monolayers. Both isolates were able to induce plaque formation within 2 to 3 days; plaques appeared as round opalescent areas which remained colourless after neutral red or crystal violet staining. A good correlation was found between the titres as determined either by counting the plaques that were visible to the naked eye before and after neutral red staining, or by enumerating fluorescence or haemadsorption foci.
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