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Mean body weights (a) and percentages of animals exhibiting clinical signs (b) for intracerebrally (IC) immunization (closed circle), subcutaneous (SC) immunization (open circle) and control (closed box) group. Each group was composed of at least twelve mice. All control mice died before 8 dpi after exhibiting clinical signs; 75% and 20% of mice died in the SC and IC groups, respectively.
