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Mean survival times of mice. Ten CD-1 mice each were intranasally infected with PrV-Ka, PrV-UL36Δ2087-2795, PrV-UL36Δ2087-2981, PrV-UL36Δ22-248, PrVUL36Δ22-248Δ2087-2981, and PrV-UL36Δ748-991, and mean survival times were calculated.