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Viral plaques of CEF cultures caused by MDV infection, and immunofluorescence assays (IFAs). (A) Viral plaques of CEF cultures caused by MDV BS/15 were evident by light microscopy at 120 h post-inoculation; (B) Specific staining of the viral plaques with an MDV gI-specific monoclonal antibody was observed by fluorescence microscopy. Scale bar: 200 μm.
