FIG. 6.

The Δm155 virus is attenuated in salivary glands. BALB/c mice were injected intravenously with 4 × 105 PFU of the indicated viruses. The mice were sacrificed 12 days after infection, and the viral titers in salivary glands and lungs were determined. Titers in organs of individual mice are shown; horizontal bars indicate the median values.