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PPV strains HLJ202108-Y and SDLC202109 with control (virus and cell) replicated in ST cells. The upper and lower panels show light and the corresponding immunofluorescent microscope images, respectively, of ST cells infected with the PPV strains. PPV-infected ST cells were fixed at 1 PID. PPV and nuclei were detected with mouse anti-PPV VP2 protein monoclonal antibody 1B7 and 4´,6-diamidino-2-phenylindole (DAPI), respectively (red for PPV antigens, and blue for nuclei).
