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Immunofluorescent staining of PRRSV infection in MA104 cells (A) and porcine alveolar macrophages (PAMs) (B) inoculated with field isolates of Porcine reproductive and respiratory syndrome virus (PRRSV). Viral nucleocapsid was visualized with monoclonal antibody SDOW-17F conjugated with fluorescein (green). The red represents counterstaining with Evan’s blue.
