Abstract
An immunoassay was developed to detect Marek's disease virus (MDV) antigen on the tips of feathers obtained from MDV-infected chickens. MDV in follicular debris on the feather tip was demonstrated by use of a specific monoclonal antibody. The principle of an indirect ELISA was employed and the feather tip was used as the solid phase. Presence of MDV was reflected by a dark brown precipitate on the feather tip which could be observed by naked eye. This test system proved to be more sensitive than the agargel precipitation (AGP) test as all feather tips of MDV-infected animals gave a positive reaction in the feather tip-ELISA whereas about a half yielded a detectable precipitate in the AGP. Advantages of this feather tip-ELISA and applications are discussed.
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