Porcine reproductive and respiratory syndrome virus: morphological, biochemical and serological characteristics of Quebec isolates associated with acute and chronic outbreaks of porcine reproductive and respiratory syndrome

animal diseases animal viruses arterivirus cerdo electron microscopy enfermedades de los animales histopathologie histopathology histopatologia macrofagos macrophage macrophages maladie des animaux microscopia microscopie microscopy pigs porcin quebec swine togaviridae viral diseases virose viroses virosis virus de los animales virus des animaux