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Titers of arenavirus in the culture-positive urine samples from 3 woodrats inoculated at age 1 day (A, B, and C), and 3 woodrats inoculated at age 10–11 weeks (D, E, and F). These 6 woodrats were from different mothers. The assays for arenavirus in the urine samples collected from woodrats E and F at 3 and 4 months post-inoculation were negative (CCID50, cell culture infectious dose). Color images available online at www.liebertonline.com/vbz
