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Diffuse positivity was observed in the brains of both BALB/c and C57BL/6 mice at 4 or 5 dpi. Positivity in the spinal cord was diffuse in BALB/c mice, but multi-focal in C57BL/6 mice. No viral RNA could be visualized in the brain and spinal cord of P. leucopus mice at 28 dpi.
