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Survival times of mice challenged with the 4496 or 4496ΔΦ strain. Two groups of 10 mice were infected intranasally with 107 CFU of the 4496 or 4496ΔΦ strain. Survival times were recorded over a period of 336 h. Data represent survival times (in hours) for each mouse. The broken line denotes the median survival time for each group.
