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Distribution of time to symptoms for each infected animal. Animals were infected with either PRV Be (wild type), PRV 104 (Y478S), PRV 105 (Y478S + Y517S), PRV 106 (Y517S), or PRV 107 (Am457) by intraocular injection as described in Materials and Methods. The time at which signs of imminent death were evident for each animal was noted before the animals were sacrificed.
