Protective Activity of PAP in CBA Mice Challenged with LCM Virus. CBA mice were inoculated with intracerebral injections of the WE54 strain of LCMV at a 1000 PFU dose level that is lethal to 100% of mice within 7–9 days. Mice were treated either with vehicle or PAP administered intraperitoneally 24 hours prior to, 1 hour prior to and 24 hours, 48 hours 72 hours and 96 hours after virus inoculation. Mice were then observed twice daily for 21 days for morbidity and mortality. (Top) Shown are representative survival curves detailing the cumulative proportions (%) of mice surviving after virus inoculation. See Table 1 for more detailed information of the treatment outcome. (Bottom) Shown is Kaplan-Meir life-table analysis and statistical comparison using the log-rank test.